Baywatch is an American action drama television series about lifeguards who patrol the beaches of Los Angeles County, California, and Hawaii, starring David Hasselhoff. It was created by Michael Berk, Douglas Schwartz, and Gregory J. Bonann, who produced the show throughout its 11-season run. The series focuses on both professional and personal challenges faced by the characters, portrayed by a large rotating ensemble cast that includes Pamela Anderson, Alexandra Paul, Gregory Alan Williams, Jeremy Jackson, Parker Stevenson, David Chokachi, Billy Warlock, Erika Eleniak, David Charvet, Yasmine Bleeth, and Nicole Eggert.

The show was cancelled after its first season on NBC, but survived through syndication and later became the most-watched television series in the world, with a weekly audience of over 1.1 billion viewers despite consistently negative critical reviews, earning it a reputation as a pop cultural phenomenon and frequent source of allusion and parody. The show ran in its original title and format from 1989 to 1999. From 1999 to 2001, with a setting change and large cast overhaul, it was known as Baywatch: Hawaii.

It spawned a spin-off series, Baywatch Nights, which aired for two seasons from 1995 to 1997, and a 2017 feature film adaptation.