| 8641 | January 20 | Birth | 1909 – Gōgen Yamaguchi, Japanese martial artist (d. 1989) |
| 8642 | January 20 | Birth | 1910 – Joy Adamson, Austrian-Kenyan naturalist, painter and author (d. 1980) |
| 8643 | January 20 | Birth | 1913 – S. M. Rasamanickam, Sri Lankan politician (d. 1974) |
| 8644 | January 20 | Birth | 1915 – Ghulam Ishaq Khan, Pakistani businessman and politician, 7th President of Pakistan (d. 2006) |
| 8645 | January 20 | Birth | 1918 – Juan García Esquivel, Mexican pianist, composer, and bandleader (d. 2002) |
| 8646 | January 20 | Birth | 1918 – W. Cleon Skousen, American author and academic (d. 2006) |
| 8647 | January 20 | Birth | 1920 – Federico Fellini, Italian director and screenwriter (d. 1993) |
| 8648 | January 20 | Birth | 1920 – DeForest Kelley, American actor, singer, and screenwriter (d. 1999) |
| 8649 | January 20 | Birth | 1920 – Thorleif Schjelderup, Norwegian ski jumper and author (d. 2006) |
| 8650 | January 20 | Birth | 1921 – Telmo Zarra, Spanish footballer (d. 2006) |
| 8651 | January 20 | Birth | 1922 – Ray Anthony, American trumpet player, composer, bandleader, and actor |
| 8652 | January 20 | Birth | 1922 – Graham Stark, English actor and director (d. 2013) |
| 8653 | January 20 | Birth | 1923 – Nora Brockstedt, Norwegian singer (d. 2015) |
| 8654 | January 20 | Birth | 1923 – Slim Whitman, American singer-songwriter and guitarist (d. 2013) |
| 8655 | January 20 | Birth | 1924 – Yvonne Loriod, French pianist and composer (d. 2010) |
| 8656 | January 20 | Birth | 1925 – Ernesto Cardenal, Nicaraguan priest, poet, and politician |
| 8657 | January 20 | Birth | 1926 – Jamiluddin Aali, Pakistani poet, playwright, and critic |
| 8658 | January 20 | Birth | 1926 – Patricia Neal, American actress (d. 2010) |
| 8659 | January 20 | Birth | 1926 – David Tudor, American pianist and composer (d. 1996) |
| 8660 | January 20 | Birth | 1927 – Qurratulain Hyder, Indian-Pakistani journalist, author, and academic (d. 2007) |
| 8661 | January 20 | Birth | 1928 – Antonio de Almeida, French conductor and musicologist (d. 1997) |
| 8662 | January 20 | Birth | 1929 – Jimmy Cobb, American drummer |
| 8663 | January 20 | Birth | 1929 – Arte Johnson, American actor, singer, and screenwriter |
| 8664 | January 20 | Birth | 1929 – Fireball Roberts, American race car driver (d. 1964) |
| 8665 | January 20 | Birth | 1930 – Buzz Aldrin, American colonel, pilot, and astronaut |
| 8666 | January 20 | Birth | 1931 – David Lee, American physicist and academic Nobel Prize laureate |
| 8667 | January 20 | Birth | 1931 – Hachidai Nakamura, Japanese pianist and composer (d. 1992) |
| 8668 | January 20 | Birth | 1932 – Lou Fontinato, Canadian ice hockey player |
| 8669 | January 20 | Birth | 1934 – Hennie Aucamp, South African poet, author, and academic (d. 2014) |
| 8670 | January 20 | Birth | 1934 – Tom Baker, English actor |