- Oct 1 Vladimir Horowitz, Russian-American classical pianist (Variations on a Theme from Carmen), born in Kiev, Russian Empire (now Ukraine) (d. 1989)
- Oct 8 René Guillou, French organist and composer (L'Autre mère), born in Rennes, Brittany, France (d. 1958)
- Oct 10 Vernon Duke [Vladimir Alexandrovich Dukelsky], American composer and songwriter ("Taking A Chance On Love"), born in Parafianovo, Russian Empire (d. 1969)
- Oct 13 Jens Bjerre, Danish composer, born in Aarhus (d. 1986)
- Oct 18 Ambrose Thibodeaux, American Cajun accordionist, also known as Ambrose Sam (d. 1995)
- Oct 18 Emile Enthoven, Dutch composer and lawyer, born in Amsterdam, Netherlands (d. 1950)
- Oct 19 Vittorio Giannini, American violinist, composer (The Medead), and educator (Curtis Institute, 1956-64), born in Philadelphia, Pennsylvania (d. 1966)
- Oct 23 Milford Dolliole, American pioneer jazz drummer, born in New Orleans, Louisiana (d. 1994)
- Oct 29 Vivian Ellis, English composer, born in Hampstead, London (d. 1996)
- Oct 30 Konrad Friedrich Noetel, German composer, born in Posen, Kingdom of Prussia (now Poznań, Poland) (d. 1947)
About October 1903
How Old? 120 years old
Generation: Greatest Generation
Leap Year: No
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