SM UB-143 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 3 October 1918 as SM UB-143.
She was surrendered to Japan on 1 December 1918 and served in the Imperial Japanese Navy as O-7 until 1921, when she was broken up in Yokohama.
Construction
Built by AG Weser of Bremen in one year of construction, UB-143 was launched at Bremen on 21 August 1918, carried 10 torpedoes and was armed with a deck gun. UB-143 would carry a crew of up to 3 officer and 31 men and had a cruising range of . Displacement was while surfaced and when submerged. Her engines enabled her to travel at when surfaced and when submerged.
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