| Season Number: | 3 |
| Bgcolour: |
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| Starring: | William Petersen Marg Helgenberger Gary Dourdan George Eads Jorja Fox Eric Szmanda Robert David Hall Paul Guilfoyle |
| Num Episodes: | 23 |
| Network: | CBS |
| Episode List: | List of CSI: Crime Scene Investigation episodes |
The third season of premiered on CBS on September 26, 2002, and ended May 15, 2003. The series stars William Petersen and Marg Helgenberger.
Grissom begins to suffer from hearing loss ("Inside the Box"), as Catherine faces the possibility of losing her daughter ("Lady Heather's Box") during the third season of CSI. Alongside their team, including Sara Sidle, Warrick Brown, Nick Stokes, and Jim Brass, Willows and Grissom investigate the death of a poker player ("Revenge is Best Served Cold"), the evisceration of a cheerleader ("Let the Seller Beware"), a death at a little persons convention ("A Little Murder"), the overdose of a rock-star ("Abra-Cadaver"), a jewelry heist ("Fight Night"), a mob murder ("Blood Lust"), the discovery of a body covered in fire-ants ("Snuff"), and a drive-by shooting ("Random Acts of Violence"). Meanwhile, the team are faced with their own past when they testify in court ("The Accused is Entitled"), Sara struggles to cope with the psychological trauma that she is suffering from being caught up in the explosion ("Play with Fire"), and one of Doc Robbins' autopsies goes awry when the victim wakes up ("Got Murder?").
Eric Szmanda and Robert David Hall, who joined the recurring cast in season one, become main cast members this season.