Mark-Paul Harry Gosselaar (pronounced GOS-ler; born March 1, 1974) is an American actor. He is best known for his roles as Zack Morris in NBC's Saved by the Bell, Good Morning, Miss Bliss, and Saved by the Bell: The College Years; Detective John Clark in ABC's NYPD Blue, Jerry Kellerman in TNT's Raising the Bar, and Peter Bash in the TNT series Franklin & Bash.

Gosselaar first came to public notice as the star of the hit television comedy series Saved by the Bell, in which he played Zack Morris, and which aired on NBC from 1989 to 1993. Gosselaar's character was adapted from the short-lived Disney sitcom Good Morning, Miss Bliss; although that show was cancelled after one season, NBC executives believed that a similar show, with Zack Morris as the series lead, had potential for success. He reprised the role in two TV movies and a less-successful spin-off, Saved by the Bell: The College Years. In 1994, Gosselaar appeared as Zack Morris in a second spin-off series Saved by the Bell: The New Class in the episode "Goodbye, Bayside – Part 2", along with Mario López as A.C. Slater and Lark Voorhies as Lisa Turtle.