Ergänzungs-Jagdgruppe Ost (EJGr Ost) was a fighter pilot training unit of the German Luftwaffe in World War II. It was formed on 27 January 1942 in Krakau and renamed Jagdgruppe Ost (JGr Ost) on 25 November 1942. Its main purpose was to provide specialized training for new fighter pilots destined for the Eastern Front. Training was provided by experienced Eastern Front veterans, who were rotated in and out of this unit.