History
United Kingdom
Builder	Joseph R Eltringham, South Shields
Launched	11 April 1918
Fate	Sold to Alloa Ship Breaking Co, Rosyth 3 October 1928
General characteristics
Class and type	Hunt-class minesweeper Aberdare sub-class
Displacement	710 tons
Length	231 ft (70 m)
Beam	28 ft (8.5 m)
Draught	8 ft (2.4 m)
Propulsion	Yarrow-type boilers, Vertical triple-expansion engines, 2 shafts, 2,200 ihp
Speed	max 16 knots
Range	140 tons coal
Complement	73 men
Armament	1 × QF 4-inch (102 mm) forward QF 76 mm (3.0 in) aft 2 × twin 0.303 inch machine guns

HMS Gretna was a Hunt-class minesweeper of the Royal Navy ordered towards the end of World War I and sold for breaking up in 1928. She is the only ship of the Royal Navy to be named Gretna.