April 23 is the 113th day of the year (114th in leap years), with 252 days remaining.

• 1806 — Hiroemon died.
• 1831 — Thomas Andrew Williamson is born.
• 1887 — Dagmar Overbye is born.
• 1918 — Helmuth Schmidt died.
• 1962 — Amy Archer-Gilligan died.
• 1969 — Linda Salee is murdered by Jerry Brudos.
• 1970 — Arwed Imiela is apprehended.
• 1977 — Patricia Atkinson is murdered by Peter Sutcliffe.
• 1979 — Lawrence Dalton is apprehended.
• 1981 — Jimmy Ray Payne is murdered by Wayne Williams.
• 1981 — John Porter is allegedly murdered by Wayne Williams (suspected victim).
• 1981 — Yuri Ustimenko is born.
• 1985 — Gary Ridgway's victim, Tammie Liles, is found.
• 1987 — Lee Choon-jae's victim, Kwon Jung-bon, is found.
• 1991 — Mario Normore is born.
• 1996 — Patricia Scott is murdered by Gregory Clepper.
• 1997 — Andrew Urdiales is apprehended.
• 2016 — Yevgeny Chuplinsky is apprehended.