German Type IXB submarine

U-123 and U-201 leaving Lorient on 8 June 1941.
Class overview
Operators:	Kriegsmarine
Preceded by:	Type IXA submarine
Succeeded by:	Type IXC submarine
Built:	1938–1940
In service:	1939–1945
In commission:	1939–1945
Planned:	14
Completed:	14
Lost:	14
General characteristics
Displacement:	1,051 t (1,034 long tons) surfaced 1,178 t (1,159 long tons) submerged
Length:	76.50 m (251 ft 0 in) overall 58.75 m (192 ft 9 in) pressure hull
Beam:	6.76 m (22 ft 2 in) overall 4.40 m (14 ft 5 in) pressure hull
Height:	9.60 m (31 ft 6 in)
Draft:	4.70 m (15 ft 5 in)
Range:	12,000 nmi (22,000 km; 14,000 mi) at 10 knots (19 km/h; 12 mph) surfaced 64 nmi (119 km; 74 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged

The German Type IXB submarine was a sub-class of the German Type IX submarine built for Nazi Germany's Kriegsmarine between 1938 and 1940. The U-boats themselves were designed to be fairly large ocean-going submarines. The inspiration for the Type IXB submarine came from the earlier original Type IX submarine, the Type IXA submarine. The design of the IXA was developed to give an increased range, a change which resulted in a slightly heavier overall tonnage. This design was improved even further in the later Type IXC submarines.

The class comprised 14 submarines, U-64, U-65, U-103, U-104, U-105, U-106, U-107, U-108, U-109, U-110, U-111, U-122, U-123, and U-124. The Type IXB submarines were the most successful class of submarine in the war in terms of the total amount to tonnage sunk, with each U-boat sinking an average of over 100,000 gross register tons (GRT) during its career.