- Oct 1 Spanish Cortes accept general female suffrage
- Oct 1 Philadelphia Athletics seek 3rd straight World Series baseball title; beat St. Louis Cardinals, 6-2 in opener at Sportsman's Park; lose series, 4-3
- Oct 1 The second (and current) Waldorf-Astoria Hotel is opened in New York.
- Oct 2 Pope Pius XI encyclical On economic crisis
- Oct 4 Dick Tracy comic strip by Chester Gould debuts
- Oct 4 Juan Esteban Montero becomes President of Chile
- Oct 5 1st nonstop transpacific flight, Japan to Wash (Herndon & Pangborn)
- Oct 5 Paul Green's "House of Connelly" premieres in NYC
- Oct 6 Js Van Severen forms Verdinaso (Union of Flemish National Solidarists)
- Oct 7 1st infra-red photograph, Rochester, NY
- Oct 10 A J Bennett hits H Garbarino for 1st scoring pass in Canada's Big 4
- Oct 10 St Louis Cards beat Philadelphia A's, 4 games to 3 in 28th World Series
- Oct 10 William Waltons "Belshazzar's Feast" premieres in Leeds
- Oct 11 100,000 extreme-right Germans form "Harzburger Front"
- Oct 12 1st International Conference on Calendar Reform
- Oct 13 Musical "Everybody's Welcome" with T/J Dorsey premieres in NYC
- Oct 13 Noel Coward's "Cavalcade" premieres in London
- Oct 14 1st broadcast of Dutch Radio Peoples University
- Oct 14 Spanish Cortes agrees to separation of Church & State
- Oct 16 US trunk murderess Winnie Ruth Judd murders two friends then dismembers one of them in Phoenix
Event of Interest
- Oct 20 Frankie Frisch of the Cards named MVP
- Oct 24 George Washington Bridge linking New York City and New Jersey dedicated, opens the next day
- Oct 24 Gangster Al Capone is sentenced to 11 years for tax evasion
- Oct 26 Eugene O'Neill's "Mourning Becomes Electra" premieres in NYC
- Oct 27 Chuhei Numbu of Japan, sets then long jump record at 26' 2½"
- Oct 29 Lefty Grove, A's pitcher who won 31 games, is named the AL's MVP
- Oct 30 W2XB TV channel 1 in NYC, NY (NBC) begins broadcasting