- Oct 1 Charlie McDonnell, British YouTube Personality, vlogger, and singer-songwriter, born in Bath, Somerset, England
- Oct 3 Rhian Denise Ramos, Filipino actress
- Oct 5 Myles Jeffrey, American actor, born in Riverside County, California
- Oct 12 Henri Lansbury, English footballer (Aston Villa), born in Enfield, London
- Oct 18 Brittany Griner, American basketball center (Olympic gold 2016, 20; WNBA C'ship 2014 Phoenix Mercury; 8 × WNBA All-Star; WNBA scoring champion 2017, 19; detained in Russia for drug smuggling Feb-Dec 2022), born in Houston, Texas
- Oct 21 Ricky Rubio, Spanish basketball player
- Oct 22 Jonathan William Lipnicki, actor (Jeff Foxworthy Show, Jerry McGuirre)
- Oct 23 Stevie Brock, American pop singer, born in Dayton, Ohio
- Oct 25 Mirim Lee, South Korean golfer (ANA Inspiration 2020), born in Seoul, South Korea
- Oct 29 Carlson Young, American actress and director, born in Fort Worth, Texas
- Oct 29 Kritidi Kharbanda, Indian actress (Googly), born in New Delhi, India
- Oct 31 Johanna Söderberg, Swedish pop-country-folk singer-songwriter (First Aid Kit - "Emmylou"), born in Enskede, Sweden
- Oct 31 Lil JJ [James Charles Lewis], American actor (Just Jordan) and singer ("Party Boi"), born in Little Rock, Arkansas
About October 1990
How Old? 33 years old
Generation: Millennial
Leap Year: No