List of Famous people born on December 21st

Donald Eugene Brownlee is a professor of astronomy at the University of Washington at Seattle and the principal investigator for NASA's Stardust mission. His primary research interests include astrobiology, comets, and cosmic dust. He was born in Las Vegas, Nevada.

John Michael Seigenthaler is an American news anchor and a member of the George Foster Peabody Awards board of jurors. He is well known as a former weekend anchor and correspondent for both NBC and MSNBC. He is the son of newspaper journalist John Lawrence Seigenthaler, and named for his father. He is best known for his eight-year tenure as weekend anchor of NBC Nightly News. In July 2008, Seigenthaler joined his family company Seigenthaler Public Relations, but continued to be based in New York. From 2013–2016 he worked for the now defunct Al Jazeera America as its evening news anchor.

Erik Nash is a three time Oscar nominated visual effects artist.

Stephen Friedman is the former Chairman of the United States President's Intelligence Advisory Board. He was nominated on October 27, 2005, to replace Brent Scowcroft in the position.

Magnus Samuelsson, is a Swedish actor, former strongman and winner of the 1998 World's Strongest Man contest in Morocco. The son of a former Swedish arm wrestling champion, he has also been ranked among the best arm wrestlers in the world and was a European Arm Wrestling champion prior to becoming a professional strongman.

Karmen Stavec is a Slovene musician and pop singer.