The Capitani Romani class was a class of light cruisers acting as flotilla leaders for the Regia Marina. They were built to outrun and outgun the large new French destroyers of the Le Fantasque and Mogador classes. Twelve hulls were ordered in late 1939, but only four were completed, just three of these before the Italian armistice in 1943. The ships were named after prominent ancient Romans.
Caio Duilio was an Andrea Doria-class helicopter cruiser of the Marina Militare. Built by Navalmeccanica at Castellammare di Stabia, it was named after the Roman consul Gaius Duilius.
The Soldati class were a group of destroyers built for the Regia Marina during World War II. The ships were named after military professions. There were two batches; twelve ships were built in 1938–1939, and a second batch of seven ships were ordered in 1940, although only five were completed.
The Sleipner class was a series of corvettes ordered as part of the Royal Norwegian Navy's 1960 fleet plan. It was intended to build five ships of the class, but because of economic problems only two were built; Sleipner and Æger.
The Impavido class were the second group of destroyers built for the Italian Navy after World War II and the first Italian guided missile destroyers. Similar in performance to the US Navy's Charles F. Adams class, these ships were essentially improved Impetuoso-class vessels, with the after gun-turret being replaced by a Tartar surface-to-air-missile launcher and associated radar.
The Brave-class fast patrol boats were a class of two gas turbine motor torpedo boats (MTBs) that were the last of their type for the Royal Navy (RN) Coastal Forces division. They formed the basis for a series of simpler boats which were widely built for export.
The Commandant Rivière class was a class of frigates built for the French Navy in the late 1950s and early 1960s. Labeled "aviso-escorteur", they were designed to perform the role of overseas patrol in peacetime and anti-submarine escort in wartime. This vessel class is named after the French Navy officer Henri Rivière (1827–1883).
The Badr class is a class of corvette built by the United States and operated by the Saudi Navy. The class has been relegated to a coastal defence role following the modernisation of the Saudi fleet. There are four vessels in service; Badr, Al Yarmook, Hitteen and Tabuk.
The Sparviero class, also known as the Nibbio class, are small hydrofoil missile boats capable of traveling at speeds of 46 knots. They were designed for and formerly used by the Italian Navy. The Japanese 1-go class missile boat is an updated version formerly used by the Japan Maritime Self-Defense Force (JMSDF).
The Alpino class were a group of two frigates built for the Italian Navy during the Cold War.
ORP Kaszub is a corvette of the Polish Navy, in service since 1987, the sole ship of the Project 620 class. She was the first ocean-going warship built in Poland. As of 2012 she is in active service.
The Ratanakosin-class corvettes are a class of two corvettes that were built for the Royal Thai Navy in the 1980s. Constructed in the United States, a third was planned to be built in Thailand, but was canceled before construction could begin. The Ratanakosin class is used as flagships for squadrons of fast attack craft. Both ships remain in service.
Tapi-class corvettes are a class of two corvettes that were built for the Royal Thai Navy in the early 1970s. Both ships remain in service.
The Bergamini class was a class of four frigates operated by the Italian Navy. They entered service in 1961, with the last one being stricken in 1988.
The Province-class fast attack craft, also known as the Dhofar class, is a British-built series of missile-armed fast attack craft for the Royal Navy of Oman.
The Albatros class was a class of eight corvettes designed and built in Italy in the 1950s. Paid for by US funds, they were operated by Italy, Denmark, Indonesia and the Netherlands. The last ships of the class were retired from service in Italy in 1991.
The Sin Hung-class torpedo boat is a class of torpedo boats in service with the Korean People's Navy. The class is based on the same hull as the Sin Hung-class hydrofoil torpedo boat, and Sin Hung-class patrol boat.
The Sa'ar 2 class ("Shalechet") is a class of missile boats built in Cherbourg, France at the Constructions Mécaniques de Normandie shipyard based on Israeli Navy modification of the German Navy's Jaguar-class fast attack craft. Three of the ships class were converted from Sa'ar 1-class patrol boats in 1974.
The Atrevida class was a class of six corvettes built for the Spanish Navy in the 1950s.
The Esmeraldas-class corvettes are a class of corvette in service with the Ecuadorian Navy, built in Italy by Fincantieri, entering service in the early 1980s.
Italian Navy 
