Jagdgeschwader 4 (JG 4) was a Luftwaffe fighter-wing of World War II. JG 4 was formed as a full Geschwader on 15 June 1944 in Ansbach from Stab/Jagdgeschwader z.b.V. and its first Geschwaderkommodore was Major Gerhard Schöpfel. I./JG 4 was assigned in early 1943 as defensive protection of the Mizil and Ploiești oil complexes in Romania. I./JG 4 first saw action in combat against the force of B-24 Liberators dispatched on the low-level attack against Ploiești on 1 August 1943, code-named Operation "Tidal Wave", claiming 12 Consolidated B-24 bombers downed.