- Oct 1 Héctor Campos Parsi, Puerto Rican classical music composer, born in Ponce, Puerto Rico (d. 1997)
- Oct 13 Harper MacKay, American orchestra leader (NBC Follies), born in Boston, Massachusetts (d. 1995)
- Oct 21 Jarmil Burghauser [Mokrý], Czech composer, choirmaster, conductor, and musicologist, born in Pisek, Czech Republic (d. 1997)
- Oct 21 Sir Malcolm Arnold, British trumpeter, and classical and film score composer (The Bridge On The River Kwai), born in Northampton, England (d. 2006)
- Oct 22 Georges Brassens, French poet and singer-songwriter (Supplique pour être enterré à la plage de Sète), born in Cette, France (d. 1981)
- Oct 23 Denise Duval, French soprano (music of Francis Poulenc), born in Paris (d. 2016)
- Oct 23 İlhan Usmanbaş, Turkish contemporary classical composer, born in Constantinople (now İstanbul), Turkey
- Oct 27 Anestis Logothetis, Austrian composer, born in Burgas, Bulgaria (d. 1994)
- Oct 28 Arturo "Chico" O'Farrill, Cuban Latin and Afro-Cuban jazz composer, arranger, and conductor, born in Havana, Cuba (d. 2001)
About October 1921
How Old? 102 years old
Generation: Greatest Generation
Leap Year: No
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