This article is about the television show. For information about naval watches, see Watch system.

Third Watch was an NBC television drama set in New York City that ran from September 23, 1999 to May 6, 2005. It followed the exploits of a group of police officers, firefighters, and paramedics in the fictional 55th Precinct and Fire Station 55 whose shifts fell between 3 p.m. and 11 p.m, the "third watch." The precinct and fire station were located on the corner of King St. and Arthur St.; hence the nickname "Camelot." Exterior shots of the 55th Precinct and the Firehouse were filmed in Long Island City, Queens. Third Watch succeeded in presenting all three branches of New York City's emergency services in the same show, reviving a failed attempt to do so nine years prior with the similarly-themed running for only one season in 1990.

The show balanced numerous single-episode events with other, ongoing storylines, some of which spanned multiple seasons. While Third Watch was lauded for its emotional and honest portrayal of the events surrounding the 9/11 terrorist attacks, it was also criticized in some circles for extremely detailed violence and prevalent (by network television standards) profane language. The show was created, produced, and written by John Wells and Edward Allen Bernero. The theme song for the show was "Keep Hope Alive" by The Crystal Method.