Class overview
Builders	Peterson Builders, Sturgeon Bay
Operators	Islamic Republic of Iran Navy
In service	1967–present
Completed	3
Active	3
General characteristics
Type	Large patrol craft
Displacement	100/105 tons standard 146/150 tons full load
Length	30.5–30.8 m (100–101 ft)
Beam	6.5–6.7 m (21–22 ft)
Draught	2.5–3.1 m (8.2–10.2 ft)
Installed power	Diesel
Propulsion	8 × GM 6-71 engines, 2,040 horsepower (1.52 MW) 2 × shafts
Speed	15–22 kn (28–41 km/h)
Range	1,140 nmi (2,110 km) at 17 knots (31 km/h) 1,500 nmi (2,800 km) at 10 knots (19 km/h)
Complement	20

The Parvin ( Persian: پروین) is a class of large patrol craft operated by the Islamic Republic of Iran Navy. They ships in the class are modified versions of PGM-71 vessels, all built by the American shipyard Peterson Builders.

Sources differ in recording characteristics of Parvin class vessels.

According to Jane's Fighting Ships, the ships have a standard displacement of 100 tonnes (98 long tons) and 150 t (150 long tons) at full load. ^[1] Conway's All the World's Fighting Ships puts the numbers at 105 tonnes (103 long tons) and 146 tonnes (144 long tons). ^[2]

The class design is 30.8 m (101 ft) long, would have a beam of 6.5 m (21 ft) and a draft of 2.5 m (8 ft 2 in) on the report of Jane's, ^[1] while Conway's mentions the dimensions as 30.5 m (100 ft) × 6.7 m (22 ft) × 3.1 m (10 ft). ^[2]

Both sources agree that the ships are powered by eight General Motors diesel engines totaling 2,040 horsepower (1.52 MW) that rotate a pair of shafts, but the engine models are variously cited GM 8-71 ^[2] and GM 6-71. ^[1] The system can reach a top speed of 15 knots (28 km/h) as stated by Conway's, ^[2] albeit Jane's mentions 22 knots (41 km/h). ^[1] The ranges given for the class are 1,140 nmi (2,110 km) at 17 knots (31 km/h) ^[1] and 1,500 nmi (2,800 km) at 10 knots (19 km/h). ^[2]

Original armament of the ships reportedly included five guns: 12.7mm and 20mm each two and one 40mm. ^[2] French sources give one 40mm and four 20mm machine guns, as well as a pair of Mk22 Mousetrap and DC racks. ^[2] As of 2015, they are reported to be armed with five guns consisting an old variant of Bofors 40 mm/60, a couple of Oerlikon GAI-BO1 20mm in addition to two 12.7 machine guns. ^[1] They are also equipped with four racks of depth charge (with eight US Mk 6), and two missile launchers of unknown type are installed on them after refit. ^[1]

The original radar was model 303 of Decca Radar, ^[2] while the current surface search system is known to be working on I-band. ^[1] The sonar is a high-frequency hull-mounted active attack SQS-17B ^{[1] [2]} but is allegedly unlikely to be serviceable per Jane's. ^[1]

Crew on each ship of this class totals 20 officers and men. ^{[1] [2]}

The ships in the class are: ^{[1] [2]}