Karl-Ernst Schroeter (3 December 1912 – 23 May 1943) was a Korvettenkapitän with the Kriegsmarine during World War II and commander of U-121 and U-752.

Schroeter is credited with sinking eight ships, all in U-752, for 33,492 GRT.

[1] Schroeter commissioned the new Type IIB U-boat U-121 on May 28, 1940 and served as her first commanding officer until March 30, 1941.

The U-121 spent her entire career as training vessel and Schroeter saw no combat in her.

Schroeter would command the U-752 for the next two years until its sinking and his death on May 23, 1943.