December 12 is the 346th day (347th on leap years) of the year. There are 19 days remaining.
- 1787 - Pennsylvania becomes the second state.
- 1870 - Joseph H. Rainey of South Carolina becomes the first black congressmen.
- 1901 - First radio transmission across the Atlantic Ocean by Guglielmo Marconi
- 1963 - Kenya gains its independence from Great Britain.
- 1821 - Gustave Flaubert, French writer
- 1915 - Frank Sinatra, entertainer
- 1940 - Dionne Warwick, Grammy Award-winning singer