The Harushio class is a diesel-electric submarine class operated by the Japanese Maritime Self-Defense Force (JMSDF). The design is an evolution from the Yūshio class being slightly larger and with better noise reduction. Asashio, has been modified to test air-independent propulsion (AIP), and the remaining vessels were decommissioned and replaced by the Oyashio-class.

Wakashio, a Harushio-class submarine
Class overview
Name	Harushio (はるしお, Spring Tide) class
Builders	Mitsubishi Heavy Industries, Kawasaki Shipbuilding Corporation
Operators	Japan Maritime Self-Defense Force
Preceded by	Yūshio class
Succeeded by	Oyashio class
Subclasses	Harushio (SS-583 to 588), Kai-Harushio (SS-589/TSS-3601)
Built	1987–1997
In commission	1990–2017
Completed	7
Retired	7
General characteristics
Type	Submarine
Displacement	SS-583 to SS-588 2,450 tonnes (surfaced) 2,750 tonnes (submerged) SS-589 (TSS-3601) 2,560 tonnes (surfaced) 2,850 tonnes (submerged), 2,900 tonnes (surfaced, April 2002), 3,200 tonnes (submerged, April 2002)
Length	SS-583 to SS-588 77 m (252 ft 7 in) SS-589 (TSS-3601) 78 m (255 ft 11 in) 87 m (285 ft 5 in) (April 2002)
Beam	10 m (32 ft 10 in)
Draught	7.7 m (25 ft 3 in)
Propulsion	1-shaft diesel-electric 3,400 shp (2,500 kW) (surfaced) 7,200 shp (5,400 kW) (submerged)
Speed	12 kn (22 km/h; 14 mph) (surfaced) 20 kn (37 km/h; 23 mph) (submerged)
Complement	SS-583 to SS-588 10 officers 65 enlisted SS-589 (TSS-3601) 71 70 (April 2002)
Sensors and processing systems	Hughes/Oki ZQQ 5B hull mounted sonar ZQR 1 towed array JRC ZPS 6 I-band search radar
Armament	6 × 21 in (533 mm) torpedo tubes with 20 reloads for: Type 89 torpedo Type 80 ASW Torpedo UGM-84 Harpoon

Natsushio, Hayashio, Arashio and Asashio are all named after World War II destroyers.