List of Famous people born in December

Abu Ali al-Mansur ibn al-Musta'li, better known by his regnal name al-Amir bi-Ahkam Allah was the tenth Fatimid Caliph, and the 20th Imam of Musta'li Isma'ili sect of Shia Islam, from 1101 to his death in 1130. Until 1121, he was a de facto puppet ruler of his uncle and father-in-law, the vizier al-Afdal Shahanshah. When the latter was murdered, possibly with al-Amir's connivance, the caliph appointed al-Ma'mun al-Bata'ihi as vizier, but took an increasing role in government, and after 1125 ruled without a vizier. His reign saw the progressive loss of all Fatimid strongholds in Palestine to the Crusaders apart from Ascalon. His assassination in 1130, leaving only his infant son al-Tayyib as heir, threw the Fatimid regime into a succession struggle during which it almost collapsed. Fatimid rule was restored with the succession of al-Amir's cousin al-Hafiz li-Din Allah in 1132, which led to the division of Musta'li Isma'ilism into the rival Hafizi and Tayyibi branches.

William Marshall Thomas is an American politician. He was a Republican member of the United States House of Representatives from 1979 to 2007, finishing his tenure representing California's 22nd congressional district and as the Chairman of the House Ways and Means Committee.

Robert Henry Timmons was an American jazz pianist and composer. He was a sideman in Art Blakey's Jazz Messengers for two periods, between which he was part of Cannonball Adderley's band. Several of Timmons' compositions written when part of these bands – including "Moanin'", "Dat Dere", and "This Here" – enjoyed commercial success and brought him more attention. In the early and mid-1960s he led a series of piano trios that toured and recorded extensively.

Joseph Offenbach was a German actor. He appeared in more than one hundred films from 1942 to 1969.

Paul Howard Holmgren is an American former professional ice hockey player and former general manager and President of the Philadelphia Flyers of the National Hockey League (NHL). He is currently a Senior Advisor to Dave Scott, Comcast Spectacor Chairman and CEO and Governor of the Flyers. He played 10 NHL seasons for the Flyers and Minnesota North Stars. After his playing career ended he moved into coaching, serving as head coach of the Flyers and Hartford Whalers, and later went into management.

Elisa Klapheck is the first female rabbi to serve in the Netherlands, although she was born in Germany. She was also one of the organizers of Bet Debora Berlin, a conference of European women rabbis, cantors, scholars, and rabbinically-educated Jews in Berlin in 1999. She was ordained in 2004 by the Aleph Rabbinic Program, and in 2005 she became the rabbi of "Beit Ha'Chidush" in Amsterdam. In 2009 she returned to Germany and has since been the rabbi of the "Egalitarian Minyan" in the Jewish Community of Frankfurt am Main. She is a member of the General Conference of Rabbis of Germany (ARK) and an associate member of the Rabbinic Board of "Liberal Judaism" in London.

Robert Leckie was an United States Marine and author of books on United States military history, sports, fiction, autobiographies, and children's books. As a young man, he served with the 1st Marine Division during World War II; his service as a machine gunner and a scout in the war greatly influenced his work.

Károly Antal Than de Apát – also called as Carl von Than – was a Hungarian chemist who discovered carbonyl sulfide in 1867.