The 2017–18 Hamburger SV season was the 99th season in the football club's history and 55th consecutive and overall season in the top flight of German football, the Bundesliga, having been promoted from the Oberliga Nord in 1963.

Finishing 17th, Hamburg was relegated for the first time in the Bundesliga's 55-year history.

In addition to the domestic league, Hamburger SV also participated in this season's edition of the domestic cup, the DFB-Pokal.

The season covers a period from 1 July 2017 to 30 June 2018.

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