| 120001 | October 20 | Birth | 1931 – Richard Caliguiri, American lawyer and politician, 54th Mayor of Pittsburgh (d. 1988) |
| 120002 | October 20 | Birth | 1931 – Mickey Mantle, American baseball player and sportscaster (d. 1995) |
| 120003 | October 20 | Birth | 1931 – Ken Morrison, English businessman |
| 120004 | October 20 | Birth | 1932 – Rosey Brown, American football player and coach (d. 2004) |
| 120005 | October 20 | Birth | 1932 – William Christopher, American actor and singer |
| 120006 | October 20 | Birth | 1932 – Rokurō Naya, Japanese voice actor (d. 2014) |
| 120007 | October 20 | Birth | 1933 – Barrie Chase, American actress and dancer |
| 120008 | October 20 | Birth | 1934 – Bill Chase, American trumpet player (Chase) (d. 1974) |
| 120009 | October 20 | Birth | 1934 – Eddie Harris, American saxophonist (d. 1996) |
| 120010 | October 20 | Birth | 1934 – Empress Michiko of Japan |
| 120011 | October 20 | Birth | 1934 – Timothy West, English actor |
| 120012 | October 20 | Birth | 1935 – Jerry Orbach, American actor and singer (d. 2004) |
| 120013 | October 20 | Birth | 1936 – Bobby Seale, American activist, co-founded the Black Panther Party |
| 120014 | October 20 | Birth | 1937 – Cancio Garcia, Filipino lawyer and jurist (d. 2013) |
| 120015 | October 20 | Birth | 1937 – Wanda Jackson, American singer-songwriter and guitarist |
| 120016 | October 20 | Birth | 1937 – Juan Marichal, Dominican baseball player and sportscaster |
| 120017 | October 20 | Birth | 1937 – Emma Tennant, English author |
| 120018 | October 20 | Birth | 1938 – Emidio Greco, Italian director and screenwriter (d. 2012) |
| 120019 | October 20 | Birth | 1938 – Iain Macmillan, Scottish photographer and educator (d. 2006) |
| 120020 | October 20 | Birth | 1939 – Patrick Hughes, English painter, illustrator, and photographer |
| 120021 | October 20 | Birth | 1940 – Kathy Kirby, English singer (d. 2011) |
| 120022 | October 20 | Birth | 1940 – Robert Pinsky, American poet and critic |
| 120023 | October 20 | Birth | 1942 – Earl Hindman, American actor (d. 2003) |
| 120024 | October 20 | Birth | 1942 – Christiane Nüsslein-Volhard, German biologist and geneticist, Nobel Prize laureate |
| 120025 | October 20 | Birth | 1942 – Bart Zoet, Dutch cyclist (d. 1992) |
| 120026 | October 20 | Birth | 1943 – Dunja Vejzović, Croatian soprano and actress |
| 120027 | October 20 | Birth | 1944 – Nalin de Silva, Sri Lankan physicist and philosopher |
| 120028 | October 20 | Birth | 1944 – David Mancuso, American party planner, created The Loft |
| 120029 | October 20 | Birth | 1946 – Diana Gittins, American-English sociologist, author, and academic |
| 120030 | October 20 | Birth | 1946 – Lewis Grizzard, American comedian and author (d. 1994) |