FC Carl Zeiss Jena is a German football club based in Jena, Thuringia. Formed in 1903 and initially associated with the Carl Zeiss AG factory, they were one of the strongest clubs in East Germany from the 1960s to the 1980s, winning the DDR-Oberliga and the FDGB-Pokal three times each and reaching the 1981 European Cup Winners' Cup Final. Since German reunification in 1990, the club have competed no higher than the second tier. In the 2020–21 season, Jena played in the Regionalliga Nordost.