"Seinfeld" was produced for nine seasons in total. The NBC sitcom premiered in 1989 and ended in 1998 after Jerry Seinfeld chose to conclude the series rather than continue into a tenth season.
The show began as a small experiment called "The Seinfeld Chronicles," but it gradually became one of television's most successful sitcoms. Its nine seasons produced 180 episodes, centered on fictionalized versions of Jerry Seinfeld, George Costanza, Elaine Benes, and Cosmo Kramer.
The ninth season was the final season. It aired from September 25, 1997, through May 14, 1998, and included the two-part series finale. NBC reportedly offered Seinfeld a huge deal for a tenth season, but he declined, believing the show should end while it remained at the top of its game.
A frequent counting mistake comes from the show's unusually short first season and from counting specials, retrospective programs, or syndicated split episodes separately. Those issues can affect episode totals, but not the season count: the series has nine official seasons.