- Feb 11 Vatican City (world's smallest country) made an enclave of Rome
- Feb 14 St Valentine's Day Massacre in Chicago, 7 gangsters killed, allegedly on Al Capone's orders
- May 16 1st Academy Awards: "Wings", Emil Jannings & Janet Gaynor win
- Jun 3 Chile and Peru sign the Treaty of Lima, finally resolving their border dispute from the War of the Pacific (1879–83). Chile keeps Arica and Peru regains Tacna.
- Jun 7 Vatican City becomes a sovereign state
- Jun 25 US President Herbert Hoover authorizes building of Boulder Dam (Hoover Dam)
- Jun 27 1st color TV demo, performed by Bell Laboratories in NYC
- Aug 11 Babe Ruth becomes 1st professional baseball player to hit 500 homers (off Willis Hudlin of Cleveland Indians)
- Oct 24 "Black Thursday", start of stock market crash, Dow Jones down 12.8%
- Oct 29 "Black Tuesday" Wall Street Stock Market crashes triggering the "Great Depression"
Women are considered "Persons" under Canadian law
On October 18, 1929