Class overview
K III
Name	K III class
Builders	Koninklijke Maatschappij De Schelde, Vlissingen
Operators	Royal Netherlands Navy
Preceded by	K II
Succeeded by	K V class
Built	1915-1921
Completed	2
General characteristics
Type	Submarine
Displacement	583 tons surfaced (K III) 579 tons surfaced (K IV) 721 tons submerged
Length	64.41 m (211 ft 4 in)
Beam	5.6 m (18 ft 4 in)
Draught	3.56 m (11 ft 8 in)
Propulsion	2 × 900 bhp (671 kW) diesel engines (K III) 2 × 600 bhp (447 kW) diesel engines (K IV) 2 × 210 hp (157 kW) electric motors
Speed	16.5 kn (30.6 km/h; 19.0 mph) surfaced (K III) 15 kn (28 km/h; 17 mph) surfaced (K IV) 8.5 kn (15.7 km/h; 9.8 mph) submerged
Range	3,500 nmi (6,500 km; 4,000 mi) at 11 kn (20 km/h; 13 mph) on the surface 25 nmi (46 km; 29 mi) at 8.5 kn (15.7 km/h; 9.8 mph) submerged
Complement	29
Armament	2 × 18 inch bow torpedo tubes 2 × 18 inch external-traversing torpedo tubes forward of the conning tower 1 x 75 mm gun 1 x 12.7 mm machine gun

The K III class was a class of two patrol submarines, built by Koninklijke Maatschappij De Schelde in Vlissingen for the Royal Netherlands Navy. They were used for patrols in the Dutch colonial waters. The submarines' diving depth was 40 metres (130 ft). The design for the double-hulled boats came from the American Electric Boat Company.