Joachim Lemelsen (28 September 1888 – 30 March 1954) was a German general during World War II who rose to army-level command.

During Operation Barbarossa, the invasion of the Soviet Union in 1941, troops of the XLVII Motorized Corps under his command executed the criminal Commissar Order, prompting Lemelsen to complain: "Soon the Russians will get to hear about the countless corpses lying along the routes taken by our soldiers (...).

Born in 1888 in Berlin, Lemelsen joined the army of Imperial Germany as an Fahnenjunker (officer cadet) in the artillery and later participated in World War I.

Serving in the Wehrmacht of Nazi Germany, he commanded the Artillery Lehr Regiment in 1934 and from the following year taught at infantry school.

Soon the Russians will get to hear about the countless corpses lying along the routes taken by our soldiers, without weapons and with hands raised, dispatched at close range by shots to the head.