CSI: NY (Crime Scene Investigation: New York, stylized as CSI: NY/Crime Scene Investigation) is an American police procedural television series that ran on CBS from September 22, 2004, to February 22, 2013, for a total of nine seasons and 197 original episodes. The show follows the investigative team of NYPD forensic scientists and police officers identified as "Crime Scene Investigators" (instead of the actual title of "Crime Scene Unit Forensic Technicians" (CSU)) as they unveil the circumstances behind mysterious and unusual deaths, as well as other crimes. The series is an indirect spin-off from the veteran series CSI: Crime Scene Investigation and a direct spin-off from CSI: Miami, during an episode in which several of the CSI: NY characters made their first appearances. It is the third series in the CSI franchise.

Originally in 2004, CSI: NY was produced in partnership with the Canadian media company Alliance Atlantis. The company dissolved after season three in 2007, and all production after that was done under the purview of CBS Paramount Television.

The series was filmed at the CBS Studio Center, with many of the outside scenes shot in and around Los Angeles. Occasionally, scenes were filmed on location in New York City.

The series aired its final episode on February 22, 2013. On May 10, 2013, CBS canceled the series after nine seasons.

Gary Sinise, Carmine Giovinazzo, Hill Harper and Eddie Cahill are the only main actors to have appeared in all 197 episodes of the television series.