The 2019–20 season was the 48th season of Agrupación Deportiva Alcorcón in existence and the club's 10th consecutive season in the second division of Spanish football. In addition to the domestic league, AD Alcorcón participated in this season's edition of the Copa del Rey. The season was due to cover a period from 1 July 2019 to 30 June 2020. It was extended extraordinarily beyond 30 June due to the COVID-19 pandemic in Spain.