U-boats of WWI

Most Successful U-boats

Below are the 30 most successful U-boats of World War One.

Boat	Ships sunk	Tons sunk	Ships hit during
U 35	226 ships	538,500 tons	1915 - 1918
U 39	154 ships	406,325 tons	1915 - 1918
U 38	139 ships	293,134 tons	1915 - 1918
U 34	119 ships	257,652 tons	1915 - 1918
U 53	88 ships	225,364 tons	1916 - 1918
U 63	73 ships	203,415 tons	1916 - 1918
U 33	84 ships	194,131 tons	1915 - 1918
U 64	46 ships	147,870 tons	1916 - 1918
U 20	37 ships	145,830 tons	1915 - 1916
UC 17	96 ships	144,423 tons	1916 - 1918
U 46	52 ships	140,314 tons	1916 - 1918
U 70	53 ships	136,578 tons	1916 - 1918
UB 40	100 ships	135,617 tons	1916 - 1918
UC 21	98 ships	134,063 tons	1916 - 1917
U 55	64 ships	133,742 tons	1916 - 1918
U 62	48 ships	132,811 tons	1917 - 1918
UB 18	128 ships	131,566 tons	1916 - 1917
UC 65	106 ships	127,218 tons	1917 - 1917
UB 57	46 ships	122,035 tons	1917 - 1918
U 24	35 ships	121,122 tons	1915 - 1917
U 155	43 ships	120,434 tons	1917 - 1918
U 32	38 ships	120,035 tons	1915 - 1918
U 86	33 ships	117,583 tons	1917 - 1918
U 73	21 ships	115,599 tons	1916 - 1918
UB 50	40 ships	114,421 tons	1917 - 1918
U 43	45 ships	114,323 tons	1916 - 1918
U 21	40 ships	113,580 tons	1914 - 1917
UC 71	63 ships	110,750 tons	1917 - 1918
UB 48	36 ships	110,095 tons	1917 - 1918
U 82	36 ships	108,310 tons	1916 - 1918
	2,187 ships	5,016,840 tons

Most of these boats were of course commanded by the most successful U-boat commanders of WWI.

WWI U-boat commanders section