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{{Short description|Austro-Hungarian lead boat of U-27 class}}
{{Use dmy dates|date=January 2024}}
{|{{Infobox ship begin
}}
{{Infobox ship image
| Ship image = SM U-27 (Austria-Hungary).jpg
| Ship caption = ''U-27'' seen at her [[Ceremonial ship launching|launch]] on 19 October 1916.
}}
{{Infobox ship career
| Ship country = Austria-Hungary
| Ship flag = {{Shipboxflag|Austria-Hungary|naval}}
| Ship name = SM ''U-27''
| Ship ordered = 12 October 1915<ref name=Miller-20>Miller, p. 20.</ref>
| Ship builder = [[Cantiere Navale Triestino]], [[Monfalcone]]
| Ship laid down = 
| Ship launched = 19 October 1916<ref name=Con-344 />
| Ship commissioned = 24 February 1917<ref name=KUK-U-27>{{cite Uboat.net
|name=KUK U27
|id=KUK+U27
|type=1sub
|access-date=17 January 2009
}}</ref>
| Ship decommissioned = 
| Ship struck = 
| Ship fate = Scrapped 1920
| Ship notes = 
| Ship badge = 
}}
{{Infobox service record
|is_ship=yes
|is_multi=yes
|commanders=
* Robert Teufl von Fernland
* 24 February – 29 December 1917<ref name=KUK-U-27 />
* Josef Holub
* 29 December 1917 – 31 October 1918
|victories=
*33 merchant ships sunk <br>({{GRT|14,325}} + Unknown GRT)<ref name=KUK-U-27 />
*1 warship sunk <br>(765 tons)
*1 warship damaged <br>(665 tons) 
*1 merchant ship taken as prize <br>(Unknown GRT)
}}
{{Infobox ship characteristics
| Ship type = {{sclass|U-27|submarine|||Austria-Hungary}}
| Ship displacement = *{{convert|264|MT|LT|abbr=on}} surfaced
*{{convert|301|MT|LT|abbr=on}} submerged<ref name=Con-344 />
| Ship length = {{convert|121|ft|1|in|m|abbr=on}}<ref name=Con-344 />
| Ship beam = {{convert|14|ft|4|in|m|abbr=on}}<ref name=Con-344 />
| Ship draft = {{convert|12|ft|2|in|m|abbr=on}}<ref name=Con-344 />
| Ship propulsion = *2 × shafts
*2 × [[diesel engine]], {{convert|270|bhp|abbr=on}} total
*2 × [[electric motor]], {{convert|280|shp|abbr=on}} total<ref name=Con-344 />
| Ship speed = *{{convert|9|knots|lk=in|km/h}} surfaced
*{{convert|7.5|knots|km/h|0}} submerged<ref name=Con-344 />
| Ship range = 
| Ship endurance = 
| Ship test depth = 
| Ship complement = 23–24<ref name=Con-344 />
| Ship armament = *2 × {{convert|45|cm|in|1|abbr=on}} bow [[torpedo tube]]s
*4 [[torpedo]]es
*1 × 75 mm/26 (3.0 in) [[deck gun]]
*1 × {{convert|8|mm|in|abbr=on}} [[machine gun]]<ref name=Con-344 />
| Ship notes = 
}}
|}
'''SM ''U-27''''' or '''''U-XXVII''''' was the [[lead boat]] of the {{sclass|U-27|submarine|4||Austria-Hungary}} of [[U-boat]]s or [[submarine]]s for the [[Austro-Hungarian Navy]]. ''U-27'' was built by the Austrian firm of [[Cantiere Navale Triestino]] (CNT) at the [[Pola Navy Yard]] and [[Ceremonial ship launching|launched]] on 19 October 1916. She was [[Ship commissioning|commissioned]] on 24 February 1917.

She had a single [[submarine hull|hull]] and was just over {{convert|121|ft|m}} in length. She [[displacement (ship)|displaced]] nearly {{convert|265|MT|LT|0}} when surfaced and over {{convert|300|MT|LT|0}} when submerged. Her two [[diesel engine]]s moved her at up to {{convert|9|knots|lk=in|km/h}} on the surface, while her twin [[electric motor]]s propelled her at up to {{convert|7.5|knots|km/h}} while underwater. She was armed with two [[Bow (watercraft)|bow]] [[torpedo tube]]s and could carry a load of up to four [[torpedo]]es. She was also equipped with a {{convert|75|mm|in|1|adj=on|abbr=on}} [[deck gun]] and a [[machine gun]].

During her service career, ''U-27'' sank the British [[destroyer]] {{HMS|Phoenix|1911|2}}, damaged the Japanese destroyer {{ship|Japanese destroyer|Sakaki|1915|2}}, and sank or captured 34 other ships totaling {{GRT|14,325}}. ''U-27'' was surrendered at [[Pula|Pola]] at war's end and handed over to Italy as a [[war reparation]] in 1919. She was broken up the following year. ''Conway's All the World's Fighting Ships 1906–1921'' calls ''U-27'' Austria-Hungary's "most successful submarine".

== Design and construction ==
[[Austria-Hungary]]'s U-boat fleet was largely obsolete at the outbreak of [[World War I]].<ref name=Con-341>Gardiner, p. 341.</ref> The [[Austro-Hungarian Navy]] satisfied its most urgent needs by purchasing five [[German Type UB I submarine|Type UB I]] submarines that comprised the {{sclass|U-10|submarine|4}} from Germany,<ref name=Con-343>Gardiner, p. 343.</ref> by raising and recommissioning the sunken French submarine {{ship|French submarine|Curie|Q 87|2}} as {{SMU|U-14|Austria-Hungary|2}},<ref name=Con-341 /><ref group=Note>{{ship|French submarine|Curie|Q 87|2}} had been caught in an [[anti-submarine net]] while trying to enter the harbor at [[Pula|Pola]] on 20 December 1914. See: Gardiner, p. 343.</ref> and by building four submarines of the {{sclass|U-20|submarine|4}} that were based on the 1911 Danish {{sclass|Havmanden|submarine (1911)|4}}.<ref name=Con-344>Gardiner, p. 344.</ref><ref group=Note>The plans for the Danish {{sclass|Havmanden|submarine|2||1911}}s, three of which were built in Austria-Hungary, were seized from [[Whitehead & Co.]] in [[Fiume]]. See: Gardiner, pp. 344, 354.</ref>

After these steps alleviated their most urgent needs,<ref name=Con-341 /> the Austro-Hungarian Navy selected the [[German Type UB II submarine|German Type UB II]] design for its newest submarines in mid 1915.<ref name=Hal-383>Halpern, p. 383.</ref> The Germans were reluctant to allocate any of their wartime resources to Austro-Hungarian construction, but were willing to sell plans for up to six of the UB II boats to be constructed under license in Austria-Hungary.<ref name=Hal-383 /> The Navy agreed to the proposal and purchased the plans from [[AG Weser]] of [[Bremen]].<ref name=BS>Baumgartner and Sieche, as excerpted [http://www.gwpda.org/naval/ahsubs.htm here] (reprinted and translated into English by Sieche). Retrieved 1 December 2008.</ref>

''U-27'' displaced {{convert|264|MT|LT}} surfaced and {{convert|301|MT|LT}} submerged.<ref name=Con-344 /> She had a single [[submarine hull|hull]] with [[Saddle tank (submarine)|saddle tank]]s,<ref name=Con-181>Gardiner, p. 181.</ref> and was {{convert|121|ft|1|in|m}} long with a [[beam (nautical)|beam]] of {{convert|14|ft|4|in|m}} and a [[draft (hull)|draft]] of {{convert|12|ft|2|in|m}}.<ref name=Con-344 /> For propulsion, she had two shafts, twin [[diesel engine]]s of {{convert|270|bhp|abbr=on}} for surface running, and twin [[electric motor]]s of {{convert|280|shp|abbr=on}} for submerged travel. She was capable of {{convert|9|knots|km/h|1}} while surfaced and {{convert|7.5|knots|km/h}} while submerged.<ref name=Con-344 /> Although there is no specific notation of a range for ''U-27'', the German UB II boats, upon which the ''U-27'' class was based, had a range of over {{convert|6000|nmi|km}} at {{convert|5|knots|km/h}} surfaced, and {{convert|45|nmi|km}} at {{convert|4|knots|km/h}} submerged.<ref name=Con-181 /> ''U-27'' class boats were designed for a crew of 23–24.<ref name=Con-344 />

''U-27'' was armed with two {{convert|45|cm|in|1|abbr=on}} bow [[torpedo tube]]s and carried a complement of four [[torpedo]]es. She was also equipped with a 75&nbsp;mm/26 (3.0&nbsp;in) [[deck gun]] and an {{convert|8|mm|in|abbr=on}} [[machine gun]].<ref name=Con-344 />

After intricate political negotiations to allocate production of the class between Austrian and Hungarian firms,<ref name=Hal-383 /> ''U-27'' was ordered from [[Cantiere Navale Triestino]] (CNT) on 12 October 1915.<ref name=Miller-20 /> She was [[keel laying|laid down]] by early 1916 at the [[Pola Navy Yard]],<ref group=Note>By this time, the [[Cantiere Navale Triestino|CNT]] shipyards at [[Monfalcone]] had been overrun by the [[Italian Army]]. See: Baumgartner and Sieche, as excerpted [http://www.gwpda.org/naval/ahsubs.htm here] (reprinted and translated into English by Sieche). Retrieved 17 January 2008.</ref> and [[launch (ship)|launch]]ed on 19 October.<!-- launch date --><ref name=Con-344 /><ref name=Hal-383 /><!-- laid down date -->

== Service career ==
After her completion, ''U-27'' was [[Ship commissioning|commissioned]] into the Austro-Hungarian Navy on 24 February 1917 under the command of ''[[Linienschiffsleutnant]]'' Robert Teufl von Fernland.<ref name=KUK-U-27 />
Previously in command of {{SMU|U-11|Austria-Hungary|2}}, von Fernland was 31-year-old native of [[Vienna]].<ref name=Fernland>{{cite Uboat.net
|name=Robert Teufl von Fernland
|id=540
|type=1comm
|access-date=19 January 2009
}}</ref> In April, von Fernland and ''U-27'' both achieved their first kills. On 12 April, ''U-27'' encountered the 3,756 GRT Greek steamship ''Niritos'' sailing from [[Genoa]] for [[Port Said]]. About {{convert|5|nmi}} off [[Augusta, Sicily|Augusta]], [[Sicily]],<ref name=nirito>{{cite Uboat.net
|name=Niritos
|id=4408
|type=1ship
|access-date=19 January 2009
}}</ref> ''U-27'' shelled and sank the 11-year-old Greek ship.<ref>{{Cite ship register|register=MSI|id=1119225|shipname=Niritos|access-date=19 January 2009
}}</ref> Four days later, von Fernland torpedoed another Greek steamer, the 2,976 GRT ''Zinovia''. Carrying coal from [[Barry, Vale of Glamorgan|Barry]] for [[Taranto]], ''Zinovia'' was sent to the bottom {{convert|5|nmi|km}} from [[Isola di Capo Rizzuto|Cape Rizzuto]].<ref>{{Cite ship register|register=MSI|id=5608112|shipname=Zinovia|access-date=19 January 2009
}}</ref>

In mid-May 1917, ''U-27'' participated in a support role in a raid on the [[Otranto Barrage]] that precipitated the [[Battle of Otranto Straits (1917)|Battle of Otranto Straits]]. On the night of 14/15 May, the Austro-Hungarian cruisers {{SMS|Helgoland|Austria-Hungary|2}}, {{SMS|Saida|1912|2}}, and {{SMS|Novara|1912|2}} attacked the [[Naval drifter|drifters]] that deployed the [[anti-submarine net]]s that formed part of the Barrage, sinking 14, damaging 5, and taking 72 prisoners.<ref name=Gib-254>Gibson and Prendergast, pp. 254–55.</ref><ref group=Note>[[Joseph Watt]], the commander of the British [[Drifter (fishing boat)|drifter]] ''Gowan Lea'', was awarded the [[Victoria Cross]] for his actions in refusing to surrender to one of the Austrian cruisers.</ref> Destroyers {{SMS|Csepel||2}} and {{SMS|Balaton||2}} were sent to simultaneously attack Italian transports shuttling between Italy and [[Vlorë|Valona]], and sank an Italian destroyer and a munitions ship. ''U-27'', which was assigned to patrol between [[Brindisi]] and [[Cattaro]], was a part of a force of three U-boats intended to intercept British and Italian ships responding to the attacks; the other two were the Austro-Hungarian {{SMU|U-4|Austria-Hungary|2}} (which was posted near Valona) and the German {{SMS|UC-25||2}} (assigned to mine Brindisi). A squadron of British cruisers and Italian and French destroyers joined the battle against the Austro-Hungarian cruisers on 15 May. Several ships on each side were damaged by the time the engagement was broken off. As a result of the attacks the drifter line of the Barrage was moved farther south and maintained only during the day, a success for the [[Central Powers]]. ''U-27'' did not take any offensive action during the raid and ensuing battle.<ref name=Gib-254 />

On 9 June, ''U-27'' sank ''Roland'', a French sailing ship, off the Greek island of [[Cerigo]].<ref name=roland>{{cite Uboat.net
|name=Roland
|id=5174
|type=1ship
|access-date=19 January 2009
}}</ref> Two days later, von Fernland torpedoed the Japanese destroyer {{ship|Japanese destroyer|Sakaki|1915|2}} between [[Cerigotto]] and Meles.<ref name=sakaki>{{cite Uboat.net
|name=Sakaki (d.)
|id=5348
|type=1ship
|access-date=19 January 2009
}}</ref> ''Sakaki'' was one of eight {{sclass|Kaba|destroyer|2}}s that were part of the Japanese contribution to the [[Allies of World War I|Allied]] effort in the Mediterranean.<ref name=Hal-393>Halpern, p. 393.</ref> Although the Japanese ships often performed escort service for British troop convoys,<ref name=Hal-393 /> Helgason does not report whether ''Sakaki'' was engaged in that duty when she was attacked.<ref name=sakaki /> Even though 68 Japanese sailors perished in the attack,<ref>Gilbert, p. 329, note 1.</ref> nearly two-thirds the complement of a typical ''Kaba''-class ship,<ref name=Con-242>Gardiner, p. 242.</ref> ''Sakaki'' remained afloat,<ref name=sakaki /> was repaired, and remained in service.<ref name=Con-242 /> On 29 December, ''Linienschiffsleutnant'' Josef Holub replaced von Fernland as commander of ''U-27''.<ref name=KUK-U-27 /> Holub, a 32-year-old [[Czechs|Czech]], had previously been in command of {{SMU|U-21|Austria-Hungary|2}} and {{SMU|U-22|Austria-Hungary|2}}.<ref name=Holub>{{cite Uboat.net
|id=511
|name=Josef Holub
|type=1ship
|access-date=19 January 2009
}}</ref> Holub recorded his first victory with ''U-27'' in January 1918. While near Marca, Sirocco, the U-boat torpedoed and sank the Italian steamer ''Andrea Costa'' on 22 January. The 3,991 GRT ''Andrea Costa'' had sailed from [[Rangoon]], but was sunk just short of her destination of [[Malta]].<ref name=andrea>{{cite Uboat.net
|name=Andrea Costa
|id=282
|type=1ship
|access-date=19 January 2009
}}</ref> A little more than four months would pass before Holub and ''U-27'' would score their next success.<ref name=U27-ships />

[[File:HMS Phoenix (1911) sinking.jpg|thumb|left|HMS ''Phoenix'' lists to port after being torpedoed, viewed from HMAS ''Warrego'']]
From late April to early May, ''U-27'' sank six small ships—five Greek and one Italian—including three on one day, 6 May. All of the ships with reported tonnages were under 50 GRT.<ref name=U27-ships /> ''U-27'' torpedoed the British destroyer {{HMS|Phoenix|1911|2}} at 09:18 on 14 May with the loss of one [[stoker (occupation)|stoker]] and one artificer.<ref>{{cite web|url=http://www.naval-history.net/xDKCas1918-05May.htm|title=Royal Naval Casualties May 1918 at Naval-History.net|access-date=28 September 2008
}}</ref><ref name=phoeni>{{cite Uboat.net
|name=Phoenix (hms)
|id=4790
|type=1ship
|access-date=19 January 2009
}}</ref> ''Phoenix'' had been attached to the group of ships patrolling the Otranto Barrage when she was torpedoed amidships on the starboard side.<ref>Gibson and Prendergast, p. 271.</ref> Although she survived the initial attack, ''Phoenix'' was listing badly and taking on large quantities of water. An attempt was made by Australian destroyer {{HMAS|Warrego|D70|2}} to tow ''Phoenix'' to safety but by 12:45 she was in danger of capsizing and her crew were removed. ''Phoenix'' eventually sank at 13:10 in position {{coord|40|23|30|N|19|14|00|E|display=inline}}.<ref name=Hep-133>Hepper, p. 133.</ref> From 3 to 11 July, ''U-27'' sank another nine ships,<ref name=U27-ships /> the largest reported being the 53 GRT sailing vessel '' Tris Adelphi''.<ref name=Tris>{{cite Uboat.net
|name=Tris Adelphi
|id=6123
|type=1ship
|access-date=19 January 2009
}}</ref> ''U-27'' dispatched three of the ships on 3 July, and sank two each on 10 and 11 July.<ref name=U27-ships /> On 13 August, ''U-27'' attacked the 2,209 GRT British steamer ''Anhui''. The 15-year-old ship was en route from [[Famagusta]] to Port Said, when ''U-27''  torpedoed her {{convert|2|nmi|km}} off [[Crete]]. Four persons on ''Anhui'' died when the ship with her general cargo went down.<ref name=anhui>{{cite Uboat.net
|name=Anhui
|id=318
|type=1ship
|access-date=19 January 2009
}}</ref>

''U-27''{{'}}s next victims were all encountered in mid-September. On 11 September, the French sailing ship ''Antoinette'' was seized as a [[prize (law)|prize]] and towed into the port of [[Beyrouth]].<ref name=antoin>{{cite Uboat.net
|name=Antoinette (p.)
|id=365
|type=1ship
|access-date=19 January 2009
}}</ref> Starting three days later, Holub and ''U-27'' sent an additional twelve small ships to the bottom, including the final six all on 20 September. Except for the two largest ships—the 113 GRT ''Agios Nicolas'' and the 103 GRT ''Theologos''—none were over 60 GRT.<ref name=U27-ships />

At the war's end, ''U-27'' was in port at Pola. The U-boat was surrendered to Italy as a [[war reparation]] in 1919 and was scrapped at [[Fiume]] in 1920.<ref name=Con-344/><ref name=Gib-388>Gibson and Prendergast, p. 388.</ref> In addition to the sinking and damaging of two destroyers, she sank or captured 34 merchant ships totaling {{GRT|14,325}}.<ref name=U27-ships /> ''Conway's All the World's Fighting Ships 1906–1921'' calls ''U-27'' Austria-Hungary's "most successful submarine".<ref name=Con-342>Gardiner, p. 342.</ref>

==Summary of raiding history==
{| class="wikitable sortable"
|+Ships sunk or damaged by SM ''U-27''<ref name=U27-ships>{{cite Uboat.net
|name=KUK U27
|id=kuk27
|type=1boat
|access-date=17 January 2009
}}</ref>
|-
! width="140px"|Date
! width="140px"|Name
! width="160px"|Nationality
! width="25px" |Tonnage<ref group=Note name=tonnage>Merchant ship tonnages are in [[gross register tons]]. Military vessels are listed by tons [[displacement (ship)|displacement]].</ref>
! width="160px"|Fate
|-
|align="right"|12 April 1917
|align="left" |[[List of shipwrecks in April 1917#12 April|''Niritos'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|3,756
|align="left" |Sunk
|-
|align="right"|16 April 1917
|align="left" |[[List of shipwrecks in April 1917#16 April|''Zinovia'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|2,976
|align="left" |Sunk
|-
|align="right"|9 June 1917
|align="left" |[[List of shipwrecks in June 1917#9 June|''Roland'']]
|align="left" |{{Flag|France|civil}}
|align="right"|703
|align="left" |Sunk
|-
|align="right"|11 June 1917
|align="left" |{{ship|Japanese destroyer|Sakaki|1915|2}}
|align="left" |{{nowrap|{{Navy|Empire of Japan}}}}
|align="right"|665
|align="left" |Damaged
|-
|align="right"|22 January 1918
|align="left" |[[List of shipwrecks in January 1918#22 January|''Andrea Costa'']]
|align="left" |{{Flag|Kingdom of Italy|civil}}
|align="right"|3,991
|align="left" |Sunk
|-
|align="right"|29 April 1918
|align="left" |[[List of shipwrecks in April 1918#29 April|''Maria'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|40
|align="left" |Sunk
|-
|align="right"|1 May 1918
|align="left" |[[List of shipwrecks in May 1918#1 May|''San Nicola'']]
|align="left" |{{Flag|Kingdom of Italy|civil}}
|align="right"|unknown
|align="left" |Sunk
|-
|align="right"|3 May 1918
|align="left" |[[List of shipwrecks in May 1918#3 May|''Panaghia'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|unknown
|align="left" |Sunk
|-
|align="right"|6 May 1918
|align="left" |[[List of shipwrecks in May 1918#6 May|''Agios Dimitrios'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|40
|align="left" |Sunk
|-
|align="right"|6 May 1918
|align="left" |[[List of shipwrecks in May 1918#6 May|''Evangelistria'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|46
|align="left" |Sunk
|-
|align="right"|6 May 1918
|align="left" |[[List of shipwrecks in May 1918#6 May|''Taxiarchis'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|40
|align="left" |Sunk
|-
|align="right"|14 May 1918
|align="left" |{{HMS|Phoenix|1911|6}}
|align="left" |{{Navy|United Kingdom}}
|align="right"|765
|align="left" |Sunk
|-
|align="right"|3 July 1918
|align="left" |[[List of shipwrecks in July 1918#3 July|''Agia Trias'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|14
|align="left" |Sunk
|-
|align="right"|3 July 1918
|align="left" |[[List of shipwrecks in July 1918#3 July|''Evangelistria'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|unknown
|align="left" |Sunk
|-
|align="right"|3 July 1918
|align="left" |[[List of shipwrecks in July 1918#3 July|''Panaghia'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|12
|align="left" |Sunk
|-
|align="right"|6 July 1918
|align="left" |[[List of shipwrecks in July 1918#6 July|''San Nicola'']]
|align="left" |{{Flag|Kingdom of Italy|civil}}
|align="right"|29
|align="left" |Sunk
|-
|align="right"|9 July 1918
|align="left" |[[List of shipwrecks in July 1918#9 July|''Tris Adelphi'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|53
|align="left" |Sunk
|-
|align="right"|10 July 1918
|align="left" |[[List of shipwrecks in July 1918#10 July|''Agios Georgios'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|17
|align="left" |Sunk
|-
|align="right"|10 July 1918
|align="left" |[[List of shipwrecks in July 1918#10 July|''Agios Loukis'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|11
|align="left" |Sunk
|-
|align="right"|11 July 1918
|align="left" |[[List of shipwrecks in July 1918#11 July|''Agios Constantinos'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|14
|align="left" |Sunk
|-
|align="right"|11 July 1918
|align="left" |[[List of shipwrecks in July 1918#11 July|''Marigo'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|unknown
|align="left" |Sunk
|-
|align="right"|13 August 1918
|align="left" |[[List of shipwrecks in August 1918#13 August|''Anhui'']]
|align="left" |{{Flag|United Kingdom|civil}}
|align="right"|2,209
|align="left" |Sunk
|-
|align="right"|11 September 1918
|align="left" |[[List of shipwrecks in September 1918#11 September|''Antoinette'']]
|align="left" |{{Flag|France|civil}}
|align="right"|unknown
|align="left" |Captured as prize
|-
|align="right"|14 September 1918
|align="left" |[[List of shipwrecks in September 1918#14 September|''Agios Nicolas'']]
|align="left" |{{Flag|United Kingdom|civil}}
|align="right"|113
|align="left" |Sunk
|-
|align="right"|17 September 1918
|align="left" |[[List of shipwrecks in September 1918#17 September|''Portaritissa'']]
|align="left" |{{Flag|Kingdom of Italy|civil}}
|align="right"|16
|align="left" |Sunk
|-
|align="right"|17 September 1918
|align="left" |[[List of shipwrecks in September 1918#17 September|''Sofia'']]
|align="left" |{{Flag|Kingdom of Italy|civil}}
|align="right"|6
|align="left" |Sunk
|-
|align="right"|18 September 1918
|align="left" |[[List of shipwrecks in September 1918#18 September|''Adelphotis'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|26
|align="left" |Sunk
|-
|align="right"|18 September 1918
|align="left" |[[List of shipwrecks in September 1918#18 September|''Agios Amma'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|16
|align="left" |Sunk
|-
|align="right"|19 September 1918
|align="left" |[[List of shipwrecks in September 1918#19 September|''Agios Spiridion'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|58
|align="left" |Sunk
|-
|align="right"|20 September 1918
|align="left" |[[List of shipwrecks in September 1918#20 September|''Aghios Nicolaos'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|unknown
|align="left" |Sunk
|-
|align="right"|20 September 1918
|align="left" |[[List of shipwrecks in September 1918#20 September|''Agios Nicolas'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|13
|align="left" |Sunk
|-
|align="right"|20 September 1918
|align="left" |[[List of shipwrecks in September 1918#20 September|''Agios Spiridion'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|18
|align="left" |Sunk
|-
|align="right"|20 September 1918
|align="left" |[[List of shipwrecks in September 1918#20 September|''Dragonos'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|unknown
|align="left" |Sunk
|-
|align="right"|20 September 1918
|align="left" |[[List of shipwrecks in September 1918#20 September|''Prof. Elias '']]
|align="left" |{{Flag|Greece|old}}
|align="right"|5
|align="left" |Sunk
|-
|align="right"|20 September 1918
|align="left" |[[List of shipwrecks in September 1918#20 September|''Theologos'']]
|align="left" |{{Flag|Greece|old}}
|align="right"|103
|align="left" |Sunk
|-
|
|
|align=right | '''Sunk:<br/>Damaged:<br/>Total:'''
|align="right"|'''15,090'''<br/>'''665'''<br/>'''15,755'''
|
|}

== Notes ==
{{Reflist|group=Note}}

== References ==
{{Reflist}}

== Bibliography ==
{{Refbegin}}
* {{cite book | last = Baumgartner | first = Lothar |author2=Erwin Sieche  | title = Die Schiffe der k.(u.)k. Kriegsmarine im Bild = Austro-Hungarian warships in photographs | language = de | location = [[Vienna|Wien]] | publisher = Verlagsbuchhandlung Stöhr | year = 1999 | isbn = 978-3-901208-25-6 | oclc = 43596931 }}
* {{cite book | editor1-last=Gardiner | editor1-first=Robert | editor2-last=Gray | editor2-first=Randal | title = Conway's All the World's Fighting Ships 1906–1921 | location = [[Annapolis, Maryland]] | publisher = [[Naval Institute Press]] | year = 1985 | isbn = 978-0-87021-907-8 | oclc = 12119866 }}
* {{cite book | last = Gibson | first = R. H. | first2= Maurice |last2=Prendergast <!-- not the American painter --> | title = The German Submarine War, 1914–1918 | location = Annapolis, Maryland | publisher = Naval Institute Press | year = 2003 | orig-year = 1931 | isbn = 978-1-59114-314-7 | oclc = 52924732 }}
* {{cite book | last = Gilbert | first = Martin | title = The First World War: A Complete History | location = [[New York City|New York]] | publisher = Owl Books | orig-year = 1994 | year = 2004 | isbn = 978-0-8050-7617-2 | oclc = 57246229 | url-access = registration | url = https://archive.org/details/firstworldwarsec00mart }}
* {{cite book | last = Halpern | first = Paul G. | title = A Naval History of World War I | location = Annapolis, Maryland | publisher = Naval Institute Press | year = 1994 | isbn = 978-0-87021-266-6 | oclc = 28411665 }}
* {{cite book | last = Hepper | first = David | title =  British Warship Losses in the Ironclad Era 1860 &ndash; 1919 | location = London | publisher = Chatham Publishing | year = 2006 | isbn = 978-1-86176-273-3}}
* {{cite book | last = Miller | first = David | title =  The Illustrated Directory of Submarines of the World | location = [[St. Paul, Minnesota]] | publisher = MBI Pub. Co | year = 2002 | isbn = 978-0-7603-1345-9 | oclc = 50208951 }}
{{Refend}}

{{U-27 class submarines}}

{{Good article}}

{{DEFAULTSORT:U0027}}
[[Category:U-27-class submarines (Austria-Hungary)]]
[[Category:U-boats commissioned in 1917]]
[[Category:1916 ships]]
[[Category:World War I submarines of Austria-Hungary]]
[[Category:Ships built in Pola]]

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French submarine Curie (Q 87) (edit)
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