The 2019–20 Adelaide United FC season was the club's 16th season since its establishment in 2003. The club participated in the A-League for the 14th time and participated in the FFA Cup for 6th time, winning the 2019 FFA Cup tournament. On 24 March 2020, the FFA announced that the 2019–20 A-League season would be postponed until further notice due to the COVID-19 pandemic in Australia and New Zealand, and subsequently extended indefinitely. The season resumed on 17 July 2020.