List of Irish state vessels

Port of Cork previously operated another Savehaven Marine Interceptor 42 pilot boat, Gleann Mor, which was acquired in 2005.^[40]

The following vessels have served with the Naval Service:^[47][48][49]

The Marine and Coastwatching Service was a naval service that operated during The Emergency. In 1946, the service was integrated into the Defence Forces as the Naval Service and these ships were sold off.^[53][54][55]

The Coastal and Marine Service (CMS) was a short-lived naval service that operated during the Irish Civil War. In addition to the CMS vessels listed below, several coastal landings were undertaken by the Irish National Army, during the civil war, using commandeered civilian passenger ships such as the TSS Arvonia and the SS Lady Wicklow.^[59][60] The CMS was disbanded in March 1924 after only several months of existence, and all of its ships, except Muirchú, were sold off.^{[53][55][61][62][63][64][65]}

There were also five unnamed patrol boats of unknown type used for river patrol.

Before Marine Institute Ireland was founded in 1991, government of Ireland operated a number of vessels as research ships.

From the late 1960s to the 1970s, the government operated two research vessels, Cú Feasa and Cú na Mara. Cú na Mara was sold after being damaged due to a fire in 1972.^[74]

In 1976, Lough Beltra was purchased by the government of Ireland and refitted as a research vessel.^[75]Cú Feasa was taken out of service in 1976 due to poor condition, leaving Lough Beltra as the only remaining Irish research vessel.^[76]

Here are listed all former Commissioners of Irish Lights (CIL) vessels (Irish Lights Tender, ILT) that served for some time after the formation of the Irish Free State in 1922. CIL as an organization predates the Republic of Ireland, and some historic CIL ships ended their service long before 1922.

• Tearaght (1892–1928) – see Kingstown Lifeboat Disaster
• Ierne (1898–1954)
• Alexandra (1904–1955)
• Deirdre (1919–1927)
• Nabro (1926–1949)
• Isolda (1928–1940) (Sunk off the Saltee Islands, County Wexford by German aircraft)
• Discovery II (1947–1948)
• Valonia (1947–1962)
• Granuaile (1948–1970)
• Blaskbeg (1953–1955)
• Isolda (1953–1976), sold to Irish Naval Service, renamed LÉ Setanta
• Ierne II (1955–1971)
• Atlanta (1959–1988)
• Granuaile II (1970–2000)
• Gray Seal (1988–1994)