Siegmund Freiherr von Schleinitz (23 July 1890 – 30 November 1968) was a German general in the Wehrmacht during World War II.

He was a recipient of the Knight's Cross of the Iron Cross of Nazi Germany.

Schleinitz surrendered to the Red Army in the course of the Soviet 1945 East Pomeranian Offensive.

Convicted as a war criminal in the Soviet Union, he was held until 1955.