Wikipedia:Selected anniversaries/January 21
- 304 - Thirteen-year-old Saint Agnes, the patron saint of young girls, was executed for refusing a marriage proposal.
- 1525 - The first Anabaptists in Switzerland re-baptized each other.
- 1793 - French Revolution: After being found guilty of treason by the National Convention, King Louis XVI was guillotined in front of a cheering crowd.
- 1915 - The first Kiwanis service club was founded in Detroit, Michigan.
- 1976 - The Concorde supersonic transports (pictured) began commercial flights to London, Paris, Bahrain, and Rio de Janeiro.
Recent days: January 20 – January 19 – January 18