List of narrow gauge railways in Ireland

Ireland formerly had numerous narrow gauge railways, most of which were built to a gauge of 3 ft. The last (non-preserved) line to close was the West Clare Railway in 1961.

List of closed lines

 * Ballycastle Railway (closed in 1950)
 * Ballymena, Cushendall and Red Bay Railway (closed in 1940)
 * Ballymena and Larne Railway (closed in 1950)
 * Bessbrook and Newry Light Railway
 * Castlederg and Victoria Bridge Tramway (closed in 1933)
 * Cavan and Leitrim Railway (closed in 1959)
 * Clogher Valley Railway (closed in 1942)
 * Cork, Blackrock and Passage Railway (closed in 1932) Converted to narrow gauge in 1902
 * Cork and Muskerry Light Railway (closed in 1934)
 * County Donegal Railways Joint Committee (closed in 1960)
 * Dublin and Lucan Electric Railway, 3 ft 6 in (1,067 mm) (closed in 1925)
 * Giant's Causeway Tramway (closed in 1949)
 * Glenariff Iron Ore and Harbour Company (closed in 1875)
 * Listowel and Ballybunion Railway (closed in 1924) Lartigue Monorail
 * Londonderry and Lough Swilly Railway (closed in 1953) Converted to narrow gauge in 1885.
 * Schull and Skibbereen Railway (closed in 1947)
 * Tralee and Dingle Light Railway (closed in 1953)
 * West Clare Railway (closed in 1961)

List of preserved or restored lines

 * Donegal Railway Heritage Centre
 * Fintown to Glenties railway, Co. Donegal - partly preserved
 * Cavan and Leitrim Railway at Dromod
 * Clonmacnoise and West Offaly Railway
 * The Giant's Causeway and Bushmills Railway
 * Waterford and Suir Valley Railway
 * Cumann Traenach na Gaeltachta Láir
 * West Clare Railway at Moyasta
 * Tralee and Dingle Light Railway at Tralee

The Irish Steam Preservation Society also operates a narrow gauge line at Stradbally, Co. Laois. This line was built in the preservation era as opposed to being one of the historic Irish narrow gauge lines.

Operational industrial lines

 * Bord na Móna - various industrial lines for transporting newly-cut peat