December 31 is the last day of the calendar year. It is the 365th day (366th in leap years).
- 1962 – Julian Stone is born.
- 1976 – Chris Terrio is born.
- 1998 – Star Wars Insider 41 is published.
- 2003 – Republic 59: Enemy Lines published.
- 2008 – Legacy 31: Vector, Part 12 published.
- 2008 – The Clone Wars: Crash Course published.
- 2018 – Star Wars Resistance shorts "Sixty Seconds to Destruction", "Buggle's Day Out" and "The Rematch" are released on YouTube.
- 2019 – The Art of Star Wars Jedi: Fallen Order to be published.