HDMS Thetis is a Thetis-class ocean patrol vessel belonging to the Royal Danish Navy.

HDMS Thetis on anti-pirate duties off the coast of Kenya, 2008.
History
Kingdom of Denmark
Name	Thetis
Laid down	10 October 1988
Launched	14 July 1989
In service	1 July 1991
Identification	IMO number: 3993600 MMSI number: 219522000 Callsign: OUEU
Status	in active service
General characteristics
Class and type	Thetis-class frigate
Type	Off Shore Patrol Frigates
Displacement	3,500 tons full load
Length	112.3 m (368 ft 5 in)
Beam	14.4 m (47 ft 3 in)
Height	37.0 m (121 ft 5 in)
Draft	6.0 m (19 ft 8 in)
Installed power	3 Detroit Diesel GM 16V 7163-7305 à 460 1 Detroit Diesel 6L-71N 1063-7005 à 120 kW (EMG)
Propulsion	3 × MAN B&W Diesel 12v28/32A-D à 2940 kW (3990 hk), single shaft 1 Brunvoll azimuth thruster (800 kW) 1 electrical Brunvoll bow thruster (600 kW)
Speed	>21.8 knots (40.4 km/h; 25.1 mph)
Range	8.700 nautical miles (16.112 km; 10.012 mi) at 15 knots (28 km/h; 17 mph)
Endurance	60 days
Boats & landing craft carried	2 7m RHIBs
Complement	52 + aircrew and transients (accommodation for up to 101 in total)
Sensors and processing systems	1 Terma Scanter Mil 009 navigational radar 1 Furuno FR-1505 DA surface search radar 1 Plessey AWS-6 air search radar 1 SaabTech Vectronics 9LV 200 Mk 3 fire control system 1 SaabTech CTS-36 hull-mounted sonar Thales TMS 2640 Salmon variable depth sonar FLIR Systems AN/AAQ-22 SAFIRE thermal imager
Electronic warfare & decoys	1 Thales Defense Ltd Cutlass radar warning receiver 1 Thales Defense Scorpion radar jammer 2 Sea Gnat launchers (for chaff and flares)
Armament	1 76-mm 62-cal. OTO Melara Super Rapid DP 7 12.7 mm heavy machine guns 4 7.62 mm light machine guns 1 depth charge rack and MU90 Advanced Lightweight Torpedo for anti-submarine warfare
Aircraft carried	1 Westland Lynx Mk.90B helicopter. From approx. 2016: MH-60R
Aviation facilities	Aft helicopter deck and hangar

In mid-1990s the ship served as a platform for seismic operations in the waters near Greenland. In 2002 she took over the role from her sister ship Hvidbjørnen as a platform for Commander Danish Task Group. The role was handed over to Absalon in September 2007.

February - April 2008 Thetis served as a protection against pirates for the World Food Programme chartered ships, carrying food aid, off the Horn of Africa. A squad of soldiers from the Frogman Corps was deployed aboard the ship.^[1][2]

In 2009 the ship served as staff ship for the NATO Mine Countermeasure Group 1.