The 2018–19 Adelaide United FC season was the club's 15th season since its establishment in 2003.

The club participated in the A-League for the 14th time and the FFA Cup for the 5th 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.

† = Scholarship or NPL/NYL-listed player Win Draw Loss Source: ultimatealeague.com Win Draw Loss