The Office of Public Works (OPW), together with the National Parks and Wildlife Service of the Department of Tourism, Culture, Arts, Gaeltacht, Sport and Media are responsible for the a number of heritage sites of Ireland. They undertake protection and conservation of Ireland's heritage (specifically buildings and historic sites).

The following is a list of Government owned heritage sites in Ireland.

A-C

• Adare Castle – Adare County Limerick – A medieval fortified castle that was an important stronghold of the Earl of Desmond.
• Altamount Gardens – Tullow, County Carlow – Old world garden, Robinsonian in style.
• Ardfert Cathedral – Ardfert, County Kerry – 12th to 17th century Cathedral.
• Athenry Castle – Athenry, County Galway – 13th century, 3-storey tower house
• Aughnanure Castle – Oughterard, County Galway – 16th-century tower house.
• Ballyhack Castle – Ballyhack, County Wexford – 15th-century tower house built by the Knights Hospitallers of St. John
• Barryscourt Castle – Carrigtwohill, County Cork – 15th to 16th century Castle.
• Blasket Center – Dunchaoin, County Kerry – interpretation center for native language, culture and tradition of Blasket Islanders.
• Boyle Abbey – Boyle, County Roscommon – 12th century Cistercian Monastery.
• Brú na Bóinne – Donore, County Meath Neolithic monuments and interpretative centre.
• Cahir Castle – Cahir, County Tipperary
• Carrowmore Megalithic Cemetery – County Sligo Neolithic monuments and interpretative centre.
• Céide Fields – County Mayo - Neolithic field system
• Connemara National Park – County Galway – 20 square kilometre park surrounding the Twelve Bens mountains.
• Coole Park Visitor Centre – Gort, County Galway, Nature reserve, former home of Lady Gregory, one of the founders of the Abbey Theatre
• Corlea Trackway Visitor Centre – Kenagh, County Longford – an Iron Age bog road, dating from 148BC.

D-K

• Derrynane House – Caherdaniel, County Kerry – Ancestral home of Daniel O'Connell.
• Desmond Castle – Kinsale, County Cork – a 16th-century Custom house.
• Desmond Hall – Newcastlewest, County Limerick a 15th-century Castle.
• Donegal Castle – Donegal, County Donegal – a 15th-century Norman tower house with the addition of a 17th-century Jacobean Manor House.
• Doneraile Park – Doneraile, County Cork – an 18th-century landscaped park.
• Dromore Wood – Ennis, County Clare – Nature reserve.
• Dun Aonghasa – Inishmore, Aran Islands, County Galway – A prehistoric stone fort.
• Dungarvan Castle – Dungarvan, County Waterford, Castle with a 12th-century shell keep, with curtain wall, corner tower and gate tower.
• Dunmore Caves – Ballyfoyle, County Kilkenny – limestone cave, site of Viking massacre in 928.
• Dwyer McAllister Cottage – Derrynamuck, County Wicklow – a traditional whitewashed cottage historically linked with the 1798 Rebellion.
• Emo Court – Emo, County Laois – a neo-classical house with extensive parklands
• Ennis Friary – Ennis, County Clare – 13th-century Franciscan Friary.
• Famine Warhouse 1848 – Ballingarry, County Tipperary – site of a skirmish in the Young Irelander Rebellion of 1848
• Ferns Castle – Ferns, County Wexford – 13th-century castle featuring circular chapel, original fireplaces and a vaulted basement.
• Fota Gardens – Fota Island, Carrigtwohill, County Cork – 110,000 square metre park with ornamental pond and Italian walled gardens.
• Gallarus Castle – Ballydavid, County Kerry – a pre 1600 castle on the Dingle Peninsula built by the Knight of Kerry.
• Garnish Island – Bantry, County Cork – Island garden sheltered in Glengarriff harbour.
• Glebe House and Gallery – Churchill, Letterkenny, County Donegal – Regency House.
• Glendalough – Glendalough, County Wicklow – monastic site founded in 6th century, site has a Round Tower, stone churches and multiple stone crosses.
• Glenveagh National Park – Churchill, Letterkenny, County Donegal – 170 square kilometres of mountains, woodland and lakes.
• Heywood Gardens – Ballinakill, County Laois – Formal garden designed by Sir Edwin Lutyens
• Hill of Tara – Navan, County Meath – Seat of the High Kings of Ireland, Pre-Christian center of political and religious power.
• Holy Cross Abbey - Holycross, County Tipperary - 12th century abbey
• Jerpoint Abbey – Thomastown, County Kilkenny – Cistercian monastery.
• John F. Kennedy Arboretum – New Ross, County Wexford – 2.52 square kilometre arboretum dedicated to US President John F. Kennedy.
• Kells Priory - Kells, County Kilkenny
• Kilkenny Castle – Kilkenny, County Kilkenny – castle with extensive parklands.
• Killarney National Park – Killarney, County Kerry – 103 square kilometres of mountains, woodlands including the Lakes of Killarney.
• Kilmacurrage Arboretum – Rathdrum, County Wicklow

L-Q

• Listowel Castle – Listowel, County Kerry – 13th century Castle.
• The Main Guard - Carrick-on-Suir, County Tipperary
• Maynooth Castle – Maynooth, County Kildare – 13th-century Castle.
• Muckross House – Killarney, County Kerry – Victorian House and Cardens located in Killarney National Park.
• Muckross Friary – Killarney, County Kerry – 15th century Franciscan friary.
• Newmills Corn and Flax Mills – Letterkenny, County Donegal – restored industrial buildings powered by watermill on the River Swilly.
• O'Dea Castle – County Clare – a 15th-century castle with high cross and visitor's centre
• Oldbridge Estate – site of Battle of the Boyne
• Old Mellifont Abbey – Tullyallen, Drogheda, County Louth – Ireland's first Cistercian abbey.
• Ormonde Castle – Carrick-on-Suir, County Tipperary – 1560s Elizabethan manor house
• Patrick Pearse's Cottage – County Galway
• Parke's Castle – County Leitrim
• Portumna Castle – Portumna, County Galway

R-Z

• Rathfarnham Castle – Rathfarnham, County Dublin
• Reginald's Tower – Waterford, County Waterford
• Rock of Cashel – Cashel, County Tipperary – traditional seat of the Kings of Munster
• Roscrea Castle – Roscrea, County Tipperary
• Ross Castle – Killarney, County Kerry
• St. Mary's Church – Gowran, County Kilkenny
• Scattery Island Cathedral and Monastery – County Clare – early Christian place of pilgrimage
• Sligo Abbey – Sligo, County Sligo
• Swiss Cottage – Cahir, County Tipperary
• Tintern Abbey – County Wexford – Cistercian abbey
• Trim Castle – Trim, County Meath – Norman castle
• Wexford Wildfowl Reserve - North Slob, County Wexford

External reference

• Heritage Sites of Ireland, Pamphlet, OPW.