HSwMS Västergötland (left)
Class overview
Name	Västergötland class
Builders	Kockums
Operators	Swedish Navy  Republic of Singapore Navy
Preceded by	Näcken class
Succeeded by	Gotland class
Subclasses	Södermanland class Archer class
Planned	4
Completed	4
Active	3
Retired	1
General characteristics
Type	Submarine
Displacement	Surfaced: 1,070 t (1,050 long tons; 1,180 short tons) Submerged: 1,150 t (1,130 long tons; 1,270 short tons)
Length	48.5 m (159 ft 1 in)
Beam	6.1 m (20 ft 0 in)
Draft	5.6 m (18 ft 4 in)
Propulsion	2 × Hedmora V12A/15 1 × Jeumont-Schneider electric motor
Speed	Surfaced: 11 kn (20 km/h; 13 mph) Submerged: 20 kn (37 km/h; 23 mph)
Complement	18 officers 6 conscripts
Sensors and processing systems	FAS
Armament	6 × 533mm tubes 3 × 400mm tubes Mines

The Västergötland class of diesel-electric submarines entered service in 1987 in the Swedish Navy allowing the last Draken II class of subs to be retired.

The original four ships of the class (Västergötland, Hälsingland, Södermanland, and Östergötland) were built between 1983 and 1988 by Kockums AB. The latter two have undergone comprehensive refits, including the insertion of a new hull section with an air-independent propulsion system equipped with Stirling engines. They have been recommissioned in 2003–2004 as the new Södermanland class.

Västergötland and Hälsingland were put in reserve until November 2005, when they were sold to the Republic of Singapore Navy as the Archer class. They were refitted to Södermanland class standards and received additional climatisation for use in tropical waters, and relaunched in 2009–2010.

Östergötland was decommissioned in 2021, leaving Södermanland as the last remaining ship of the class in Swedish service.^[1]

• List of submarine classes in service
• Collins-class submarine - enlarged versions of Västergötland used by the Royal Australian Navy
• List of active Swedish Navy ships

• Darman, Peter, ed. (2004). Twenty-first Century Submarines and Warships. Military Handbooks. Rochester: Grange Books. ISBN 1-84013-678-2.
• Gardiner, Robert; Chumbley, Stephen; Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis: Naval Institute Press. ISBN 1-55750-132-7.
• Miller, David (1989). Modern Submarines. Combat Arms. New York: Prentice Hall Press. ISBN 0-13-589102-7.