The 2008–09 Süper Lig was the fifty-first season since its establishment. It began on 22 August 2008 and ended on 31 May 2009. Galatasaray were the defending champions.

The Süper Lig, officially known as Trendyol Süper Lig for sponsorship reasons, is a Turkish professional league for association football clubs. It is the top-flight of the Turkish football league system and is run by the Turkish Football Federation. In the 2023 to 2024 season, twenty clubs compete, where a champion is decided and three clubs are promoted from, and another three relegated to the 1. Lig. The season runs from August to May, with each club playing 38 matches. Matches are played Friday through Monday.