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 published.
- 2003 – Republic 59 published.
- 2008 – Legacy (2006) 31 published.
- 2008 – The Clone Wars: Crash Course published.
- 2016 – Jacob Witkin dies.
- 2018 – Star Wars Resistance shorts "Sixty Seconds to Destruction," "Buggle's Day Out" and "The Rematch" are released on YouTube.
- 2019 – Star Wars: Collecting a Galaxy: The Art of Sideshow published.
- 2024 – "Zero Friends Again" aired on Disney+.
- 2024 – Star Wars: Darth Vader Vol. 10 – Phantoms published.
- 2024 – Star Wars Insider: The High Republic: Starlight Stories reprinted in paperback.
- 2025 – Boba Fett — Black, White & Red 4 published.
- 2025 – Hyperspace Stories: The Bad Batch—Rogue Agents 1 published.
