- Jan 3 John Russell, American actor (Pale Rider, Rio Bravo), born in Los Angeles, California (d. 1991)
- Jan 9 Lister Sinclair, Canadian broadcaster and playwright, born in Mumbai, India (d. 2006)
- Jan 11 Gory Guerrero, professional wrestler (d. 1990)
- Jan 11 Kathleen Byron, British actress (Abdication, Profile, Saving Private Ryan), born in London, England (d. 2009)
- Jan 15 Frank Thornton, British actor (Are You Being Served?, Last of the Summer Wine), born in Dulwich, London (d. 2013)
- Jan 17 Dehl Berti, Chiricahua Apache actor (Bonanza, Gunsmoke, Guns of Paradise), born in Pueblo, Colorado (d. 1991)
- Jan 21 John Doucette, American actor (The Lone Ranger, Lock Up, Big Town), born in Brockton, Plymouth County Massachusetts (d. 1994)
- Jan 27 Donna Reed, American actress (From Here to Eternity; It's a Wonderful Life; The Donna Reed Show), born in Denison, Iowa (d. 1986)
- Jan 28 Alfred Marks, British actor and comedian (Desert Mice, Scream & Scream Again), born in Holborn, London (d. 1996)
- Jan 29 Anthony George, American actor (Checkmate; Dark Shadows), born in Endicott, New York (d. 2005)
- Jan 31 Carol Channing, American actress (Gentlemen Prefer Blondes; Hello Dolly), singer and comedian, born in Seattle, Washington (d. 2019)
- Jan 31 John Agar, American actor (Sands of Iwo Jima, Fort Apache), born in Chicago, Illinois (d. 2002)
- Jan 31 Mario Lanza [Alfredo Arnold Cocozza], Italian-American actor and singer (Great Caruso; Toast of New Orleans), born in Philadelphia, Pennsylvania (d. 1959)
About January 1921
How Old? 103 years old
Generation: Greatest Generation
Leap Year: No
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