December 21 is the 355th day (356th in leap years) of the year. There are 10 days remaining.
- 1948 – Samuel L. Jackson is born.
- 1975 – Chip Zdarsky is born.
- 1977 – Jacopo Camagni is born.
- 1982 – Luis Antonio Delgado is born.
- 1983 – Return of the Jedi Weekly 27 published.
- 1985 – Return of the Jedi Weekly 131 published.
- 1987 – The Lucasfilm Fan Club Magazine 2 is published in the winter.
- 1988 – The Lucasfilm Fan Club Magazine 6 is published in the winter.
- 1990 – Mandeep Dhillon is born.
- 2001 – Star Wars Gamer 8 shipped to subscribers.
- 2003 – Ron Frazier dies.
- 2005 – Republic 80 published.
- 2005 – Empire 38 published.
- 2011 – Knight Errant: Deluge 5 published.
- 2016 – Doctor Aphra (2016) 2 published.
- 2016 – Star Wars Rebels Magazine 26 published.
- 2019 – Gerry Alanguilan dies.
- 2020 – The Vow of Silver Dawn chapters eight and nine are published.
- 2021 – Star Wars: Darth Vader Vol. 3 — War of the Bounty Hunters published.
- 2021 – Star Wars Adventures: The Light and the Dark published.
- 2021 – Star Wars: Be More Boba Fett published.
- 2021 – Star Wars: Darth Vader by Charles Soule Omnibus published.
- 2021 – "Star Wars Inside Intel: Holidays of the Galaxy" published on StarWars.com.