Saturday Night Live aired its fourth season during the 1978–1979 television season on NBC. The fourth season started on October 7, 1978 and ended on May 26, 1979. The season four DVD was released on December 2, 2008.

The entire cast from the previous season returned. This would be the final season for Dan Aykroyd and John Belushi. Aykroyd and Belushi left to work on The Blues Brothers film.