The fourth season of WordGirl debuted 5 September 2011 and ended 11 June 2012.
| Ep. | Prod code | Airdate | Segment 1 | Segment 2 |
|---|---|---|---|---|
| 66/130 | 401 | 9/5/2011 | Sonny Days with a Chance of Showers | Seymour... Right After This |
| 67/130 | 402 | 10/10/2011 | The Fill-In | Word (Hicc)Up! |
| 68/130 | 403 | 10/11/2011 | Mouse Brain Take-Over | Leslie Makes It Big |
| 69/130 | 404 | 10/12/2011 | Chuck with a Sidekick of Brent | Yarn-4-Gold |
| 70/130 | 405 | 10/13/2011 | Whammer Anniversary | Rat Trap |
| 71/130 | 406 | 10/14/2011 | WordGirl and Bobbleboy | Crime in the Key of V |
| 72/130 | 407 | 11/14/2011 | Where Have All the Villains Gone? | Captain Tangent Returns |
| 73/130 | 413 | 12/16/2011 | A World Without WordGirl (Two-part episode) | |
| 74/130 | 408 | 1/16/2012 | Have Snob, Will Travel | Tobey's Playground Calamity |
| 75/130 | 410 | 3/23/2012 | The Learnerer | Mr. Big's Dinner and a Scam |
| 76/130 | 409 | 4/16/2012 | The Birthday Girl's Monstrous Gift | Hal the Haggler |
| 77/130 | 411 | 5/21/2012 | Wordbot | Mount Rushhere |
| 78/130 | 412 | 6/11/2012 | Road Rage, Anger, and Fury | By Jove, You've Wrecked My Robot! |