JS Ōmi in January 2017.
History
Japan
Name	Ōmi (おうみ)
Namesake	Lake Ōmi
Owner	Japan Maritime Self-Defense Force
Builder	Hitachi Shipbuilding Corporation, Maizuru Ishikawajima-Harima Heavy Industries, Tokyo
Laid down	7 February 2003
Launched	19 February 2004
Commissioned	3 April 2006
Home port	Yokosuka
Identification	Pennant number: AOE-426
Status	Active
General characteristics
Class & type	Mashū-class replenishment ship
Displacement	13,500 tonnes standard
Length	221 m (725 ft 1 in)
Beam	27.0 m (88 ft 7 in)
Draught	8.0 m (26 ft 3 in)
Propulsion	2 × Kawasaki Rolls-Royce Spey SM1C gas turbines 40,000 shp (29,828 kW) each 2 × shafts
Speed	24 knots (44 km/h; 28 mph)
Range	9,500 nmi (17,594 km; 10,932 mi) at 20 knots (37 km/h; 23 mph)
Complement	150
Sensors & processing systems	OPS-28 Surface Search RDF OPS-20 Navigation RDF
Electronic warfare & decoys	NOLR-8 RDF Interceptor Mk.137 decoy launchers
Armament	2 × Phalanx CIWS
Aircraft carried	1 × helicopter
Aviation facilities	Helicopter deck and enclosed hangar

Ōmi (AOE-426) is the second ship of the Mashū-class replenishment ships of the Japanese Maritime Self-Defense Force. She was commissioned on 3 April 2006.^[1][2]

She was laid down on 7 February 2003 and launched on 19 February 2004. Commissioned on 3 April 2006 with the hull number AOE-426.

The ship participated in the Japan-India Maritime Exercise (JAIMEX-25) with INS Sahyadri of the Indian Navy between 16 and 18 October 2025. Other Japanese ships, including Asahi and Jinryū, also participated in the exercise. Sahyadri was on an operational deployment to the South China Sea and the Indo-Pacific and conducted a port call at the Yokosuka Naval Base.^[3][4]

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  JS Ōmi and JS Murasame at Yokosuka on 26 October 2011.
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  JS Ōmi at Yokosuka on 26 October 2011.
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  JS Ōmi and JS Yūgiri at Yokosuka on 18 May 2015.
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  JS Ōmi at Yokosuka on 18 May 2015.
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  JS Ōmi along with INS Sahyadri and a Kamorta-class corvette during a Malabar exercise.