Bruno von Warendorp or Brun Warendorp was alderman and mayor of Lübeck, where he was born.
The son of Gottschalk Warendorp, Bruno became a ratsherr in 1366 and mayor of the Hanseatic cities in 1367. In 1368 he led Lübeck's contingent in the Confederation force which marched against Waldemar IV of Denmark. He died after Lübeck's successful siege of Helsingborg but before the stronghold was handed over. Helsingborg's capture laid the foundations for the Peace of Stralsund the following year.