The 2017–18 Adelaide United FC season was the club's 14th season since its establishment in 2003.

The club participated in the A-League for the 13th time and the FFA Cup for the 4th time.

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

Players may hold more than one non-FIFA nationality.

Last updated: 15 April 2018.