December 30 is the 364th day of the year (365th in leap years), with 1 day remaining.
- 1610 — Elizabeth Báthory is apprehended.
- 1914 — Ray Copeland is born.
- 1931 — Henry Busch is born.
- 1931 — Shinkichi Sakurada died.
- 1932 — Daisy de Melker died.
- 1944 — Michael Downes is born.
- 1947 — Pierre Bodein is born.
- 1950 — Franklin Click died.
- 1973 — Harry Lanham died.
- 1976 — Niels Högel is born.
- 1989 — Louis Gaskin is apprehended.
- 1989 — Paul Mason died.
- 1997 — Kim Sun-ja died.
- 1999 — Javed Iqbal is apprehended.
- 2016 — John Arthur Ackroyd died.
- 2020 — Samuel Little died.