- Class: U31 - 11 submarines of 1914
- Displacement: 685/878 tons
- Dimensions: 212.5 x 20.75 x 11.75 ft.
- Machinery: Diesel engines, 2 screws. 1,850/1,200 h.p. = 16.7/9.7 knots
- Armament: 4-19.7 in. T.T. (2 bow, 2 stern); 1-3.4 in. gun
- Complement: 35
- Builder: Germania Werft
- Launched: 18 Apr 1914
- Completed: 1914
- Actions: One of the most successful submarines of WWI. Sent to the Mediterranean late summer 1915, where she had several successes under Capt Waldemar Kophamel. Then taken over by Lothar von Arnauld de la Periere, who would become Germany's "Ace of aces". After a diplomatic mission to Spain in June 1916, she sank or seized 39 ships totaling 56,818 tons in one cruise. On her next cruise starting in July, she sank 54 ships in 25 days totaling 90,150 tons, almost all in surface attacks and with the expenditure of only four torpedoes. Von Arnauld later went on to command U139 and in ten total war patrols racked up a total of about 400,000 tons of Allied shipping. When the Austro-Hungarian Empire concluded an Armistice with the Allies on 3 November 1918, U35 tried to return to Germany, but only made it to Barcelona, where she was interned on 26 November. Later she was broken up at Blyth in 1919.