2013–14 1. FSV Mainz 05 season

The 2013–14 season was the 109th season of competitive association football played by 1. Fußball- und Sportverein Mainz 05, a professional football club based in Mainz, Rhineland-Palatinate, Germany. The club's 13th-placed finish in 2012–13 meant the club would again compete in the Bundesliga, alongside the DFB-Pokal. The 2013–14 season ran from 1 July 2013 to 30 June 2014.

The club finished 7th in the Bundesliga, securing qualification for the following season's UEFA Europa League qualification rounds. Manager Thomas Tuchel left the club at the end of the season.