Oskar Kummetz (21 July 1891 – 17 December 1980) was an admiral with the Kriegsmarine during World War II.

He also served in the Kaiserliche Marine during World War I. Kummetz was awarded the Knight's Cross of the Iron Cross for his actions in the Battle of Drøbak Sound, during which his command, the Blücher, was hit in the superstructure by two 28 cm shells from Norwegian fortress Oscarsborg, 15 cm shells from Kopås fortress and 5.7 cm gunfire from Husvik fortress.

Along with hundreds of other survivors, including Generalmajor Erwin Engelbrecht, Kummetz was detained by Norwegian guardsmen at a farm near Drøbak on 9 April, before the Germans arrived and they were abandoned by their captors.

[1] His next command, the Admiral Hipper, unsuccessfully attacked a British convoy during the Battle of the Barents Sea, and the Hipper was damaged by British cruisers, while his escort, the Z16 Friedrich Eckoldt was sunk with all hands by HMS Sheffield (C24).

On 1 March 1944, Kummetz became the Commander-in-Chief of Naval High Command Baltic Sea in Kiel.