SM UB-83 was a German Type UB III submarine or U-boat in the German Imperial Navy () during World War I. She was commissioned into the German Imperial Navy on 15 October 1917 as SM UB-83.
UB-83 was sunk on 10 September 1918 by off Orkney at , all 35 of the crew members died in the event.
She was built by AG Weser of Bremen and following just under a year of construction, launched at Bremen on 15 September 1917. UB-83 was commissioned later that same year under the command of Oblt.z.S. Günther Krause. Like all Type UB III submarines, UB-83 carried 10 torpedoes and was armed with a deck gun. UB-83 would carry a crew of up to 3 officer and 31 men and had a cruising range of . UB-83 had a displacement of while surfaced and when submerged. Her engines enabled her to travel at when surfaced and when submerged.