| 12001 | January 30 | Birth | 1861 – Charles Martin Loeffler, French-American violinist and composer (d. 1935) |
| 12002 | January 30 | Birth | 1862 – Walter Damrosch, German-American conductor and composer (d. 1950) |
| 12003 | January 30 | Birth | 1864 – James Mitchel, Irish-American hammer thrower (d. 1921) |
| 12004 | January 30 | Birth | 1866 – Gelett Burgess, American author, poet, and critic (d. 1951) |
| 12005 | January 30 | Birth | 1875 – Walter Middelberg, Dutch rower (d. 1944) |
| 12006 | January 30 | Birth | 1878 – Anton Hansen Tammsaare, Estonian author (d. 1940) |
| 12007 | January 30 | Birth | 1882 – Franklin D. Roosevelt, American lawyer and politician 32nd President of the United States (d. 1945) |
| 12008 | January 30 | Birth | 1883 – Peeter Süda, Estonian organist and composer (d. 1920) |
| 12009 | January 30 | Birth | 1889 – Jaishankar Prasad, Indian poet and playwright (d. 1937) |
| 12010 | January 30 | Birth | 1890 – Bruno Kastner, German actor, producer, and screenwriter (d. 1932) |
| 12011 | January 30 | Birth | 1894 – Boris III of Bulgaria (d. 1943) |
| 12012 | January 30 | Birth | 1899 – Max Theiler, South African-American virologist and academic Nobel Prize laureate (d. 1972) |
| 12013 | January 30 | Birth | 1901 – Rudolf Caracciola, German race car driver (d. 1959) |
| 12014 | January 30 | Birth | 1902 – Nikolaus Pevsner, German-English historian and scholar (d. 1983) |
| 12015 | January 30 | Birth | 1910 – Chidambaram Subramaniam, Indian lawyer and politician, Indian Minister of Defence (d. 2000) |
| 12016 | January 30 | Birth | 1911 – Roy Eldridge, American trumpet player (d. 1989) |
| 12017 | January 30 | Birth | 1912 – Werner Hartmann, German physicist and academic (d. 1988) |
| 12018 | January 30 | Birth | 1912 – Francis Schaeffer, American pastor and theologian (d. 1984) |
| 12019 | January 30 | Birth | 1912 – Barbara W. Tuchman, American historian and author (d. 1989) |
| 12020 | January 30 | Birth | 1913 – Alfrēds Riekstiņš, Latvian military officer and freedom fighter (d. 1952) |
| 12021 | January 30 | Birth | 1913 – Amrita Sher-Gil, Hungarian-Indian painter (d. 1941) |
| 12022 | January 30 | Birth | 1913 – Percy Thrower, English gardener and television host (d. 1988) |
| 12023 | January 30 | Birth | 1914 – Luc-Marie Bayle, French commander and painter (d. 2000) |
| 12024 | January 30 | Birth | 1914 – John Ireland, Canadian-American actor and director (d. 1992) |
| 12025 | January 30 | Birth | 1914 – David Wayne, American actor and singer (d. 1995) |
| 12026 | January 30 | Birth | 1915 – Joachim Peiper, German SS officer (d. 1976) |
| 12027 | January 30 | Birth | 1915 – John Profumo, English soldier and politician Secretary of State for War (d. 2006) |
| 12028 | January 30 | Birth | 1917 – Paul Frère, Belgian race car driver and journalist (d. 2008) |
| 12029 | January 30 | Birth | 1918 – David Opatoshu, American actor and screenwriter (d. 1996) |
| 12030 | January 30 | Birth | 1919 – Nikolay Glazkov, Russian actor and poet (d. 1979) |