Jagdgeschwader 20 (JG 20) was a Luftwaffe fighter wing during the early phase of World War II in Europe.

JG 20 was founded on 15 July 1939 in Döberitz, composed of one Gruppe and two Staffeln.

A third Staffel was added on 5 November 1939 in Brandenburg-Briest.

During the Battle of France it was subordinated to Luftflotte 2.

The unit's commanders included Hauptmann Hannes Trautloft, from 19 September 1939 to 4 July 1940.