Degrassi Junior High is a Canadian television series created by Kit Hood and Linda Schuyler. The second series in the Degrassi franchise and the first to be set in a universe that has spanned multiple decades, it aired on the CBC from 18 January 1987 to 27 February 1989, and on PBS in the United States starting from September 1987. A non-union show, it was primarily produced by Playing With Time with involvement from WGBH. Although not generally acknowledged by the mainstream, it has been frequently referred to as a pioneer of the teen drama genre that prefigured later and better-known series such as Beverly Hills, 90210 and Dawson's Creek.

The series was developed by Hood and Schuyler in response to what they perceived to be a lack of proper educational programming targeted toward teenagers. It centres on an ensemble cast of students attending the titular fictional school as they deal with various issues and challenges. It often mixed comedy and drama, with serious storylines often balanced with more light-hearted secondary plots. The cast comprised unknown kids, most of whom had never acted before, picked for their believability rather than experience. It was primarily filmed at the Vincent Massey Public School in Toronto, Ontario and frequently features the Queen-Broadview Village.

Initially a modest commercial success, it received glowing reviews from critics who hailed it as a superior alternative to American teen media. In late 1987, it was moved to a prime-time slot and subsequently became the top-rated domestic drama series in Canada, averaging over a million viewers a week; in 1988, the series won four Gemini Awards. Cast members drew a fanaticism likened to Beatlemania. It was broadcast and later syndicated in nearly a hundred countries, with considerable overseas success in Australia. Several episodes were withheld by the BBC, who later dropped the show altogether.

The show experienced renewed interest in the 1990s due to re-runs and syndication, resulting in the proliferation of an online fandom. This resurgence, coupled with a televised reunion on the CBC's Jonovision in 1999, led to its revival as Degrassi: The Next Generation (2001–15), where several original characters returned in recurring adult roles. In 2017, the series was named by the Toronto International Film Festival as one of Canada's most significant contributions to the cinematic landscape.