The 2020–21 ADO Den Haag season was the club's 116th season in existence and the 13th consecutive season in the top flight of Dutch football. In addition to the domestic league, ADO Den Haag participated in this season's edition of the KNVB Cup. The season covered the period from 1 July 2020 to 30 June 2021.
Source: Eredivisie,[1] Soccerway[2] Rules for classification: Season in progress: 1) Most points won; 2) Less points lost; 3) Goal difference; 4) Goals scored; 5) Alphabetical order; End of season: 1) Points; 2) Goal difference; 3) Goals scored; 4) Head-to-head points; 5) Head-to-head goal difference; 6) Head-to-head away goals scored; 7) Play-off if relevant for deciding champion, relegation or participating in a European league, otherwise by draw. 8) Penalty shoot-out (only after a play-off)[3] (R) Relegated Notes: