Emer-class offshore patrol vessel

	LÉ Aisling departing Dublin in 2009
Class overview
Builders	Verolme Dockyard, Cork
Operators	Initial; Irish Naval Service; Export; Libyan Navy; Maritime Squadron of the Armed Forces of Malta; Nigerian Navy;
Preceded by	LÉ Deirdre
Succeeded by	Róisín class
Built	1977–1980
In service	1978–present
General characteristics
Type	Offshore patrol vessel
Displacement	1,019 t (1,003 long tons)
Length	65.20 m (213 ft 11 in)
Beam	10.50 m (34 ft 5 in)
Draught	4.40 m (14 ft 5 in)
Speed	31.5 knots (58.3 km/h; 36.2 mph) (maximum)
Complement	46 (5 officers and 41 ratings)
Armament	1 × Bofors 40/L70 gun; 2 × Rheinemetall RH202 20 mm cannons; MAG58 7.62 mm machine guns;

The Emer-class offshore patrol vessel was a class of three offshore patrol vessels (OPV) operated by the Irish Naval Service from January 1978 until June 2016. After decommissioning from the Irish Naval Service, the ships were acquired and put into service by a number of foreign navies.