- Oct 4 Philadelphia Athletics' Jack Quinn aged 47, oldest to play in World Series; pitches 2 innings in Game 3, 5-0 defeat to St. Louis; win series, 4-2
- Oct 5 British airship crashes in storm at Beauvais, France, 48 die
- Oct 5 Homecoming of the bodies of Swedish polar balloon expedition (1897) led by Salomon August Andrée
Baseball History
Oct 10 AP votes Joe Cronin unofficial AL MVP & BWA names Hack Wilson NL MVP
Yankees Sign McCarthy
Oct 10 MLB New York Yankees announce signing former Chicago Cubs manager Joe McCarthy to manage for 4 years
Girl Crazy
Oct 14 George Gershwin and Ira Gershwin's musical "Girl Crazy" starring Ginger Rogers and featuring debut of Ethel Merman, opens at the Alvin Theater, NYC; runs for 272 performances
- Oct 18 Joseph Sylvester becomes 1st jockey to win 7 races in 1 day
- Oct 19 Jules Ladoumègue runs world record 1 km (2:23.6)
- Oct 20 Adventures of Sherlock Holmes, premieres on NBC radio
- Oct 20 British White Paper restricts Jews from buying Arab land
- Oct 22 1st concert of BBC Symphony Orchestra, at Queen's Hall, under Adrian Boult
- Oct 22 Blake & Razaf's "Lew Leslie's Blackbirds of 1930" premieres in NYC
- Oct 22 SC Genemuiden soccer team forms
Brazilian Coup d'état
Oct 24 A bloodless coup d'état in Brazil ousts Washington Luís Pereira de Sousa, the last President of the First Republic. Getúlio Vargas then installed as "provisional president."
- Oct 25 1st indoor American football game Convention Hall in Atlantic City; a 7–0 victory by Washington & Jefferson over Lafayette, two Pennsylvania college teams
- Oct 25 Transcontinental and Western Air (TWA) begins 1st scheduled US transcontinental air service between NYC and Los Angeles, California; 30 hour trip includes overnight stop in Kansas City, Missouri
Zolotoy Vyek
Oct 26 Dmitri Shostakovich's ballet "Zolotoy Vyek" premieres in Leningrad
Admirals
Aviators
Gangsters
Generals
Industrialists
Suffragists