December 12 is the 346th day (347th in leap years) of the year, with 19 days remaining.
- 1899 — Arnold Sodeman is born.
- 1917 — Eddie Leonski is born.
- 1931 — Gilbert Paul Jordan is born.
- 1933 — Martin Gray died.
- 1934 — Dick Marquette is born.
- 1945 — José Paz Bezerra is born.
- 1946 — Richard Allen Jensen is born.
- 1952 — Ahmad Suradji is born.
- 1954 — Piroska Jancsó-Ladányi died.
- 1954 — Dorothy Williams is born.
- 1963 — José Victor Fortes is born.
- 1965 — Sokichi Furutani is apprehended.
- 1970 — Martin Ney is born.
- 1975 — Robert Biehler is apprehended.
- 1986 — Roberto Gerardo Castro Mora and Francis Eduviges Salazar Suárez are murdered by "El Psicópata".
- 1988 — Bruce Davis died.
- 1990 — Arthur Gatter died.
- 1997 — James Phillip Barnes is apprehended.
- 2003 — Robert Stansbury died.
- 2023 — Ramati Sathyanarayana is apprehended.