Ergänzungs-Jagdgruppe Ost
Gruppenkommandeure:
Formed 27.1.42 in Cracow from Ergänzungsgruppe/JG52 (Stab only), 1. staffel from Ausbildungsstaffel/JG51, 2./Ost from Ausb.Staffel/JG52, 3./Ost from Ausb.Staffel/JG54 and 4./Ost from Ausb.Staffel/JG77.
The Ergänzungs-Jagdgruppe Ost was renamed Jagdgruppe Ost in 12.42. On 10.2.44 4./JGr. Ost and 1./JGr. Süd exchanged designations.
2.11.44 JGr. Ost was redesignated III./EJG1.
Bases:
| 1.42 - 11.42 | Cracow | Bf 109E/F/G | |
| 11.42 - 21.2.44 | St. Jean d'Angely | Bf 109F/G, Fw 190A | |
| 21.2.44 - 2.11.44 | Liegnitz* | Bf 109G, Fw 190A |
* 2. and 4./JGr. Ost was based at Weidenguth, 2.44 - 11.44