- Sep 7 Vera Zvonareva, Russian tennis player (4 x Grand Slam doubles titles; US Open, Wimbledon 2010 runner-up; Federation Cup 2004, 08), born in Moscow, Russia
- Sep 8 Peter Whittingham, English footballer, born in Nuneaton, England
- Sep 8 Vitaly Petrov, Russian racing driver (Renault F1 Team in 2010), born in Vyborg, Soviet Union
- Sep 9 James Hildreth, English cricketer, born in Milton Keynes, United Kingdom
- Sep 12 Taylor Jenkins, American basketball head coach (Memphis Grizzlies 2019-), born in Arlington, Texas
- Sep 18 Anthony Gonzalez, American politician (Rep-(R)-Ohio 2019-) and football player, born in Cleveland, Ohio
- Sep 21 Benjamin Wildman-Tobriner, American swimmer
- Sep 22 Thiago Emiliano da Silva, Brazilian football player (Paris Saint-Germain, Brazil national team), born in Rio de Janeiro
- Sep 23 Anneliese van der Pol, Dutch-American actress (That's So Raven & Raven's Home -"Chelsea"), born in Naaldwijk, Netherlands
- Sep 23 Matt Kemp, American MLB baseball outfiekder, 2006-20, 3X All-Star, 2X Gold Glove (Los Angeles Dodgers, and four other teams), born in Midwest City, Oklahoma
- Sep 25 Matt Carle, American ice hockey player, born in Anchorage, Alaska
- Sep 27 John Lannan, American baseball player
- Sep 28 Ryan Zimmerman, American baseball player
- Sep 29 Per Mertesacker, German football player (Arsenal), born in Hanover, West Germany
About September 1984
How Old? 39 years old
Generation: Millennial
Leap Year: Yes
Baseball Players
Basketball Stars
Boxers
Footballers
NFL Stars
Tennis Champions