| 9721 | January 23 | Birth | 1918 – Gertrude B. Elion, American biochemist and pharmacologist, Nobel Prize laureate (d. 1999) |
| 9722 | January 23 | Birth | 1918 – Florence Rush, American social worker (d. 2008) |
| 9723 | January 23 | Birth | 1919 – Frances Bay, Canadian-American actress (d. 2011) |
| 9724 | January 23 | Birth | 1919 – Hans Hass, Austrian biologist and diver (d. 2013) |
| 9725 | January 23 | Birth | 1919 – Ernie Kovacs, American actor and game show host (d. 1962) |
| 9726 | January 23 | Birth | 1919 – Bob Paisley, English footballer and manager (d. 1996) |
| 9727 | January 23 | Birth | 1920 – Henry Eriksson, Swedish runner (d. 2000) |
| 9728 | January 23 | Birth | 1920 – Walter Frederick Morrison, American businessman invented the Frisbee (d. 2010) |
| 9729 | January 23 | Birth | 1922 – Leon Golub, American painter (d. 2004) |
| 9730 | January 23 | Birth | 1923 – Horace Ashenfelter, American runner |
| 9731 | January 23 | Birth | 1923 – Cot Deal, American baseball player and coach (d. 2013) |
| 9732 | January 23 | Birth | 1923 – Walter M. Miller, Jr., American soldier and author (d. 1996) |
| 9733 | January 23 | Birth | 1924 – Frank Lautenberg, American soldier and politician (d. 2013) |
| 9734 | January 23 | Birth | 1925 – Marty Paich, American pianist, composer, producer, and conductor (d. 1995) |
| 9735 | January 23 | Birth | 1926 – Kyriakos Matsis, Cypriot EOKA member (d. 1958) |
| 9736 | January 23 | Birth | 1926 – Bal Thackeray, Indian journalist, cartoonist, and politician (d. 2012) |
| 9737 | January 23 | Birth | 1927 – Lars-Eric Lindblad, Swedish-American businessman and explorer (d. 1994) |
| 9738 | January 23 | Birth | 1927 – Jack Quinlan, American sportscaster (d. 1965) |
| 9739 | January 23 | Birth | 1927 – Fred Williams, Australian painter (d. 1982) |
| 9740 | January 23 | Birth | 1928 – Chico Carrasquel, Venezuelan baseball player and manager (d. 2005) |
| 9741 | January 23 | Birth | 1928 – Jeanne Moreau, French actress, singer, director, and screenwriter |
| 9742 | January 23 | Birth | 1929 – Filaret, Ukrainian patriarch |
| 9743 | January 23 | Birth | 1929 – Myron Cope, American journalist and sportscaster (d. 2008) |
| 9744 | January 23 | Birth | 1929 – Phillip Knightley, Australian journalist, author, and critic |
| 9745 | January 23 | Birth | 1929 – John Polanyi, German-Canadian chemist and academic Nobel Prize laureate |
| 9746 | January 23 | Birth | 1930 – William R. Pogue, American colonel, pilot, and astronaut (d. 2014) |
| 9747 | January 23 | Birth | 1930 – Derek Walcott, Saint Lucian poet and playwright Nobel Prize laureate |
| 9748 | January 23 | Birth | 1932 – George Allen, English footballer |
| 9749 | January 23 | Birth | 1932 – Bill Sharpe, American triple jumper |
| 9750 | January 23 | Birth | 1932 – Larri Thomas, American actress and dancer (d. 2013) |