The 2019–20 Fortuna Düsseldorf season was Fortuna Düsseldorf's 121st edition in existence and the club's 39th succession season in the top flight of Germany football.

In addition to the domestic league, Fortuna Düsseldorf contested in 2019–20 DFB-Pokal.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.