Fifteen (known as Hillside in Canada) is a teen drama television series that aired on YTV in Canada and on Nickelodeon from 1991 to 1993. Created and produced by John T. Binkley, the series was Nickelodeon's only teenage soap opera. The show was shot on videotape, similar to most daytime dramas.

The series was first conceived as Hillside in an improvised form for The Disney Channel, where a 13-episode pilot series was produced and tested in the United States. After Disney decided not to proceed with the project, Nickelodeon and Canadian partners joined Binkley in producing the series; which was known in its first and second seasons as Hillside in Canada, and throughout the 65-episode run as Fifteen in the United States.

The show was subsequently syndicated around the world, with runs in Germany and Israel, among others. Rerun rights are held by the Peter Rodgers Organization, which has made the first season available for free on Prime Video.

The series features a large ensemble cast that underwent several changes over the show's four-season run. Notable cast members include Laura Harris, Enuka Okuma, and Ryan Reynolds (Reynolds later admitted to disliking working on the show so much that he briefly considered quitting acting altogether).