Athletics
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- Garret Anderson – Major League Baseball player[1]
- Garrett Atkins – Major League Baseball player[2]
- C. David Baker – commissioner of the Arena Football League and former Irvine Council member[3]
- Dotsie Bausch – Olympic cyclist[4]
- Amanda Beard – Olympic swimmer[5]
- Steve Birnbaum (born 1991) – soccer player[6]
- Travis Brody – professional football player[7]
- JT Daniels – quarterback for the West Virginia Mountaineers
- Lindsay Davenport – professional tennis player[1]
- Anthony Davis – former National Football League player[8]
- Austin Daye – National Basketball Association player[9]
- Darren Daye – former National Basketball Association player[9]
- Eric Ebert – professional football (soccer) player[10]
- Jim Edmonds – Major League Baseball player[1]
- Julie Ertel – Olympic triathlete (2008 Summer Olympics) and water polo player (2000 Summer Olympics)[11]
- Benny Feilhaber – professional soccer player[12]
- Vince Ferragamo – formal NFL/CFL quarterback - Led Los Angeles Rams to Super Bowl appearance, 1980
- Kevin Friedland (born 1981) - soccer player
- Shawn Green – former Major League Baseball player; 2-time All-Star[1]
- Bob Hamelin – former Major League Baseball player[13]
- Dan Haren – Major League Baseball pitcher[14]
- Nick Hornsby (born 1995), basketball player for Hapoel Be'er Sheva in the Israeli Basketball Premier League
- Quinton Jackson – professional mixed martial arts fighter and UFC former light-heavyweight champion[15]
- Adam Keefe – former National Basketball Association player[16]
- Carnell Lake – five-time NFL Pro Bowl player and UCLA Bruins assistant football coach[17]
- Mark Langston – former Major League Baseball player[18]
- Jason Lezak – Olympic swimmer, four-time gold medal winner.[19]
- Chris Lewis – former professional tennis player[20]
- Chris Mandeville – former National Football League defensive back[21]
- Michael McClune – professional tennis player[22]
- Mark McGwire – former Major League Baseball player[23]
- Beverly Oden – Olympic volleyball player[24]
- Elaina Oden – Olympic volleyball player[25]
- Kim Oden – Olympic volleyball player[25]
- Aaron Peirsol – Olympic swimmer[26]
- Shar Pourdanesh – former National Football League player, first Iranian-born player in NFL, starting tackle for Washington Redskins and Pittsburgh Steelers
- Chris Pronger – National Hockey League player[1]
- Jimmy Raye – former National Football League player and offensive coordinator for the San Francisco 49ers[27]
- Joe Sambito – retired Major League pitcher
- Monte Scheinblum – 1992 U.S. National and world long-driving champion[28]
- Scott Spiezio – former Major League Baseball player[29]
- Eliot Teltscher – Top-10 tennis player[30]
- Natasha Watley – Olympic softball player[31]
- Zack Weiss (born 1992), Major League Baseball player[32]
- Caroline Zhang – figure skater[33]