List of Famous people born in December

Guilherme de Sá is a singer, songwriter, writer, poet, music producer and Brazilian arranger, best known for being the exvocalist of the Christian rock band Rosa de Saron from 2001 to 2019, making his last presentation with the group on February 10 of that year, in São Paulo – SP

Fionnghuala Manon "Fionnula" Flanagan is an Irish stage, television and film actress. For her contributions to the entertainment industry, she was given the IFTA Lifetime Achievement Award in 2012. Flanagan is known for her roles in the films James Joyce's Women (1985) and The Others (2001), for the latter of which she won a Saturn Award. She was honored with the Maureen O'Hara Award at the Kerry Film Festival in 2011, the award is offered to women who have excelled in their chosen field in film. She was also nominated for two Primetime Emmy Awards and two Tony Awards during her acting career. In 2020, she was listed at number 23 on The Irish Times's list of Ireland's greatest film actors.

Ellen Karolina Sofia Key was a Swedish difference feminist writer on many subjects in the fields of family life, ethics and education and was an important figure in the Modern Breakthrough movement. She was an early advocate of a child-centered approach to education and parenting, and was also a suffragist.

Thelonious Sphere "T. S." Monk III is an American jazz drummer, composer and bandleader. He is the son of jazz pianist Thelonious Monk.

Lucie Cousturier was a French painter and writer. She was known for the sympathetic books she wrote about her experiences traveling in French West Africa in 1921-22.

Brice Leeson, 3rd Earl of Milltown was an Anglo-Irish peer.