- Sep 1 Gillian Boxx, American softball catcher (Olympic gold 1996; 4 x All-American), born in Fontana, California
- Sep 1 Zach Thomas, American College/Pro Football HOF middle linebacker (Texas Tech; 7 × Pro Bowl; 5 × First-team All-Pro; Miami Dolphins), born in Pampa, Texas
- Sep 2 Jason Blake, American hockey player
- Sep 2 Matthew Dunn, Australian swimmer (World C'ship SC gold x 8), born in Leeton, Australia
- Sep 3 Damon Stoudamire, American basketball guard (NBA Rookie of the Year 1996; Toronto Raptors) and coach (University of the Pacific 2016-21), born in Portland, Oregon
- Sep 5 Jenny Whittle, Australian basketball center (Olympic bronze 1996), born in Gold Coast, Australia
- Sep 6 Carlo Cudicini, Italian football goalkeeper, born in Milan, Italy
- Sep 6 Greg Rusedski, Canadian-British tennis star (1995 Seoul), born in Montreal, Quebec
- Sep 8 Khamis Al-Owairan, Saudi Arabian soccer midfielder (105 caps; Al-Hilal, Al Ittihad), born in Riyadh, Saudi Arabia (d. 2020)
- Sep 9 Kazuhisa Ishii, Japanese baseball player, born in Chiba, Japan
- Sep 10 Ferdinand Coly, Senegalese soccer defender (44 caps; Poitiers FC, Châteauroux, Lens), born in Dakar, Senegal
- Sep 10 Ghada Shouaa, Syrian athlete (Syria's 1st Olympic gold heptathlon 1996; World C'ship gold 1995), born in Mhardeh, Syria
- Sep 11 Fred Thomas, American NFL cornerback (Seattle Seahawks), born in Bruce, Mississippi
- Sep 12 Darren Campbell, British athlete (Olympic gold 4x100m relay 2004, silver 200m 2000), born in Manchester, England
- Sep 12 Martin Lapointe, Canadian ice hockey player, born in Ville St. Pierre, Quebec, Canada
- Sep 13 Christine Arron, French track and field sprinter, born in Les Abymes, Guadeloupe, France
- Sep 13 Fabio Cannavaro, Italian footballer (Parma), born in Naples, Italy
- Sep 13 Marcelinho Paulista, Brazilian footballer, born in Cotia, Brazil
- Sep 13 Philip Dulebohn, American pairs figure skater (US Championship Gold, 2003), and coach, born in Silver Spring, MaAryland
- Sep 14 Linvoy Primus, English footballer (Charlton Athletic, Barnet), born in Forest Gate, England
- Sep 16 Alexander Vinokourov, Russian-Kazakhtani road cyclist, born in Petropavl, Kazakh S.S.R.
- Sep 16 Clint Peay, American soccer defender (Olympic gold 1996), born in Columbia, Maryland
- Sep 16 George Corrie, English footballer, born in Workington, England
- Sep 17 David Reid, American light middleweight boxer (Olympic gold 1996), born in Philadelphia, Pennsylvania
- Sep 17 Demis Nikolaidis, Greek footballer (AEK Athens), born in Giessen, West Germany
- Sep 18 Paul Brousseau, Canadian ice hockey player, born in Pierrefonds, Quebec, Canada
- Sep 19 Cristiano da Matta, Brazilian auto racer (CART FedEx Series 2002), born in Belo Horizonte, Brazil
- Sep 19 Nick Colgan, Irish football goalkeeper, born in Drogheda, Ireland
- Sep 20 Ronald McKinnon, American NFL linebacker, born in Elba, Alabama
- Sep 21 Oswaldo Sanchez, Mexican soccer goalkeeper (99 caps; Guadalajara 272 games, Santos Laguna 296 games) and broadcaster (Televisa Deportes), born in Guadalajara, Mexico
- Sep 21 Virginia Ruano-Pascual, tennis star, born in Madrid, Spain
- Sep 24 Eddie George, American College Football Hall of Fame running back, 1996-2004 (Heisman Trophy 1995, Ohio State; Pro Bowl 1997-2000, Houston Oilers/Tennessee Titans, and 1 other team), born in Philadelphia, Pennsylvania
- Sep 24 Rodrick Rhodes, American NBA basketball forward, 1997-2003 (Houston Rockets and 2 other teams), born in Jersey City, New Jersey
- Sep 25 Tijani Babangida, Nigerian soccer player (Nigeria, Ajax), born in Kaduna, Nigeria
- Sep 26 Chris Small, Scottish snooker player, born in Edinburgh, United Kingdom
- Sep 26 David Richie, American NFL defensive tackle (Denver Broncos-Super Bowl 32), born in Orange, California
- Sep 26 Olga Vasdeki, Greek triple jumper, born in Volos, Greece
- Sep 27 Tina Nicholson, WNBA guard (Cleveland Rockers)
- Sep 28 Brian Rafalski, American international and NHL ice hockey player, 1999-2011 (New Jersey Devils, Detroit Red Wings), born in Dearborn, Michigan
About September 1973
How Old? 50 years old
Generation: Generation X
Leap Year: No
Baseball Players
Basketball Stars
Boxers
Footballers
NFL Stars
Tennis Champions