The XV Mountain Corps was a German military formation that commanded German forces conducting counter-insurgency operations against the Yugoslav Partisans in the Independent State of Croatia during World War II.

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XV Mountain Corps
Active	1943–45
Country	Germany
Branch	Army
Type	Mountain
Role	counter-insurgency
Size	Corps
Engagements	Operation Rösselsprung
Commanders
Notable commanders	Ernst von Leyser Gustav Fehn

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It was formed in the Balkans from the staff of the German commander in Croatia (German: Militärbefehlshabers in Kroatien) on 12 August 1943.^[3] It was subordinated to the 2nd Panzer Army.

• from its formation until 1 November 1943 the corps was commanded by General der Infanterie (Lieutenant General) Rudolf Lüters.
• between 1 November 1943 and July 1944 it was commanded by General der Infanterie Ernst von Leyser.
• He was replaced in August 1944 by General der Panzertruppe (Lieutenant General) Gustav Fehn who commanded the corps for the rest of the war.

In May 1944, the corps was responsible for the conduct of Operation Rösselsprung, which was aimed at killing the Partisan leader Josip Broz Tito. The corps was effectively destroyed in Partisan Lika-Primorje operation. Remnants of the corps surrendered to the Partisans on 8 May 1945, and Fehn and many of the remaining men of the corps were subsequently killed by the Yugoslav authorities.