Saturday Night Live aired its fifteenth season during the 1989 - 1990 television season on NBC. The fifteenth season started off with a 15th anniversary special on September 24, 1989 and ended on May 19, 1990. 21 episodes were produced, including the anniversary special.

Few changes happened before the start of the season. The only change was the absence of Ben Stiller. After being on the show for five episodes, Stiller left the show due to creative differences with Lorne Michaels. Mike Myers was upgraded to repertory status.

This season saw the first hosting gigs of three celebrities who would go on to be frequent SNL hosts: John Goodman, Christopher Walken, and Alec Baldwin.

This season is also notorious for an in-cast spat towards the end of the season. Nora Dunn staged a boycott over the host of the episode, controversial comedian Andrew Dice Clay. Dunn refused to appear in the episode because of Clay's profane jokes about women. The original musical guest for the episode, Sinéad O'Connor, joined Dunn in her boycott and canceled her scheduled appearance. O'Connor was replaced by Julee Cruise and The Spanic Boys.