| 12391 | January 31 | Birth | 1933 – Camille Henry, Canadian ice hockey player and coach (d. 1997) |
| 12392 | January 31 | Birth | 1933 – Bernardo Provenzano, Italian mobster |
| 12393 | January 31 | Birth | 1934 – Ernesto Brambilla, Italian motorcycle racer and race car driver |
| 12394 | January 31 | Birth | 1934 – Gene DeWeese, American writer (d. 2012) |
| 12395 | January 31 | Birth | 1934 – James Franciscus, American actor and producer (d. 1991) |
| 12396 | January 31 | Birth | 1934 – Bob Turner, Canadian ice hockey player (d. 2005) |
| 12397 | January 31 | Birth | 1935 – Kenzaburō Ōe, Japanese author and academic Nobel Prize laureate |
| 12398 | January 31 | Birth | 1937 – Regimantas Adomaitis, Lithuanian actor |
| 12399 | January 31 | Birth | 1937 – Andrée Boucher, Canadian educator and politician, 39th Mayor of Quebec City (d. 2007) |
| 12400 | January 31 | Birth | 1937 – Philip Glass, American composer |
| 12401 | January 31 | Birth | 1937 – Suzanne Pleshette, American actress and singer (d. 2008) |
| 12402 | January 31 | Birth | 1938 – Beatrix of the Netherlands |
| 12403 | January 31 | Birth | 1938 – Lynn Carlin, American actress |
| 12404 | January 31 | Birth | 1938 – James G. Watt, American lawyer and politician, 43rd United States Secretary of the Interior |
| 12405 | January 31 | Birth | 1939 – Claude Gauthier, Canadian singer-songwriter and actor |
| 12406 | January 31 | Birth | 1940 – Kitch Christie, South African rugby player and coach (d. 1998) |
| 12407 | January 31 | Birth | 1941 – Dick Gephardt, American lawyer and politician |
| 12408 | January 31 | Birth | 1941 – Gerald McDermott, American author and illustrator (d. 2012) |
| 12409 | January 31 | Birth | 1941 – Jessica Walter, American actress |
| 12410 | January 31 | Birth | 1942 – Daniela Bianchi, Italian actress |
| 12411 | January 31 | Birth | 1942 – Derek Jarman, English director, stage designer, and author (d. 1994) |
| 12412 | January 31 | Birth | 1944 – Connie Booth, American-English actress and psychotherapist |
| 12413 | January 31 | Birth | 1944 – Charlie Musselwhite, American singer-songwriter and harmonica player |
| 12414 | January 31 | Birth | 1945 – Rynn Berry, American historian and author (d. 2014) |
| 12415 | January 31 | Birth | 1945 – Brenda Hale, Baroness Hale of Richmond, English lawyer, judge, and academic |
| 12416 | January 31 | Birth | 1945 – Joseph Kosuth, American photographer and illustrator |
| 12417 | January 31 | Birth | 1946 – Sylvia Hitchcock, American model, Miss Universe 1967 (d. 2015) |
| 12418 | January 31 | Birth | 1946 – Terry Kath, American singer-songwriter and guitarist (d. 1978) |
| 12419 | January 31 | Birth | 1946 – Glynn Turman, American actor, director, and producer |
| 12420 | January 31 | Birth | 1947 – Jonathan Banks, American actor |