The 1920–21 Eintracht Frankfurt season was the 21st season in the club's football history.
It was the first full season under the name Eintracht after merging of Frankfurter FV and the gymnastics club Frankfurter Turngemeinde von 1861.
The season ended up with Eintracht winning Kreisliga Nordmain for the second time in a row. In the northern section of the South German championship group Eintracht didn't qualify for the championship knockout stage.
26 September 1920 (1920-09-26) Since Helvetia's player Wunderlich was capped for the international match Germany v Austria in Vienna the league match was played as a friendly and rescheduled for 20 February 1921.
Note: Match abandoned after 75 minutes when home supporters invaded the pitch after a sending-off. The match was valued 2-0 in favour for Eintracht Frankfurt in an armchair decision.