Otto Steinbrinck (19 December 1888 – 16 August 1949) was a highly decorated World War I naval officer and German industrialist who was later indicted and found guilty in the Nuremberg Flick Trial.

Steinbrinck's leading position within the Flick conglomerate and his role in integrating coalmines and heavy industry in occupied West Europe into the German war economy were what in the end brought him before the court at Nuremberg.

Moreover, he carried out various other functions, becoming in April 1938 a Wehrwirtschaftsführer (War Economy Leader) – a title given industrialists who were important to Germany's armament industry – and as of January 1939 a SS-Brigadeführer.

From March 1942 until the evacuation of the western occupation zones in the autumn of 1944, Steinbrinck was also general plenipotentiary for the Reichsvereinigung Kohle for mining and coal economy in the Netherlands, Belgium and France, the so-called Beko (Befehlskommando) West.

In April 1945 – World War II had by now long ago been lost – Steinbrinck operated as a link between Ruhr industry and Army Group B under Generalfeldmarschall Walter Model.