1. Fußball- und Sport-Verein Mainz 05 e. V., usually shortened to 1. FSV Mainz 05, Mainz 05 or simply Mainz, is a German professional sports club, founded in 1905 and based in Mainz, Rhineland-Palatinate. Mainz 05 play in the Bundesliga, the top tier of the German football league system, having most recently been promoted ahead of the 2009–10 season. The club's main local rivals are Eintracht Frankfurt and Kaiserslautern. In addition to the football division, Mainz 05 have handball and table tennis departments.

The Bundesliga, sometimes referred to as the Fußball-Bundesliga or 1. Bundesliga, is a professional association football league in Germany. At the top of the German football league system, the Bundesliga is Germany's primary football competition. The Bundesliga comprises 18 teams and operates on a system of promotion and relegation with the 2. Bundesliga. Seasons run from August to May. Games are played on Fridays, Saturdays and Sundays. All of the Bundesliga clubs take part in the DFB-Pokal cup competition. The winner of the Bundesliga qualifies for the DFL-Supercup.