- Oct 3 Ashlee Simpson, American pop singer (Autobiography), born in Waco, Texas
- Oct 4 Lena Katina, Russian singer (t.A.T.u.)
- Oct 6 Joanna Pacitti, American actress and singer
- Oct 7 Ikuta Toma, Japanese singer and actor, born in Hokkaido, Japan
- Oct 9 Ghetts [Justin Clarke], British musician, born in Plaistow, East London, England
- Oct 10 Stephanie Cheng, Hong Kong singer (Traffic Light), born in Hong Kong
- Oct 13 Misono [Kōda], Japanese pop singer (Day After Tomorrow; "It's All Love!"), and TV personality (Quiz! Hexagon II), born in Kyoto, Japan
- Oct 15 Jessie Ware, British pop singer-songwriter ("What's Your Pleasure?"), born in Hammersmith, London, England
- Oct 16 Shayne Ward, British singer (UK X Factor - "That's My Goal"), and actor (Coronation Street), born in Tameside, Greater Manchester, England
- Oct 18 Esperanza Spalding, American jazz bassist, singer and songwriter (Radio Music Society; 12 Little Spells), born in Portland, Oregon
- Oct 19 Thundercat [Stephen Bruner], American bass guitarist (Flying Lotus), born in Los Angeles, California
- Oct 24 Kaela Kimura, Japanese model and singer (Rirura Riruha), born in Adachi, Tokyo
Katy Perry (39 years old)
Oct 25 American pop singer ("I Kissed A Girl"; "Teenage Dream"; "Firework"), and TV personality (American Idol, 2018-present), born in Santa Barbara, California
- Oct 25 Sara Lumholdt, Swedish musician (A-Teens), born in Stockholm, Sweden
- Oct 26 Amanda Overmyer, American rock singer (American Idol season 7 finalist), and nurse, born in Mulberry, Indiana
- Oct 29 Chris Baio, American rock bassist (Vampire Weekend - "A-Punk"; "Oxford Comma"), born in Bronxville, New York
About October 1984
How Old? 39 years old
Generation: Millennial
Leap Year: Yes
Country Singers
Jazz Singers
Opera Singers
Pop Singers
Rappers
Rock Singers