This is a list of the longest place names in Ireland. It includes names written in English as a single word of at least 20 letters. The vast majority of English-language place names in Ireland are anglicisations of Irish language names. The spelling which has legal force is usually that used by the Ordnance Survey of Ireland. Many of Ireland's longest place names are found in the far west of the island, where the Irish language has survived the longest; including Gaeltacht areas, where it is still the vernacular. These names are generally written as multiple words in Irish.

At 22 letters long, Muckanaghederdauhaulia (from Muiceanach idir Dhá Sháile meaning "pig-marsh between two saltwaters") is often believed to be Ireland's longest one-word place name.Gerry Coughlan & Martin Hughes. Irish Language and Culture. Lonely Planet, 2007. Page 213."Well, I'm glad you asked ... it's all here in Erindipity". Irish Independent. 24 November 2006. In Life: A User's Manual by Georges Perec, it is one of the ports visited and painted by the character Bartlebooth, who believes it to be the longest port name in the world. An 1830s boundary survey uses the spelling Mwickanaghedderauhaulia, which is 23 letters long.

However, the Placenames Database of Ireland (logainm.ie) records several other place names of at least 22 letters. Furthermore, the anglicised form Muckanaghederdauhaulia ceased to have official standing in 2005, after a Placenames Order was made under the Official Languages Act 2003; the sole official name is now the Irish form Muiceanach idir Dhá Sháile.

Multiple-word place names may be longer still. For example, "Plughoge and Leabrannagh Mountain North", the name of a townland in County Donegal, has 35 letters, and its Irish equivalent "Sliabh Phlochóige agus Leadhb Reannach Thuaidh" has 41; while "Stack's to Mullaghareirk Mountains, West Limerick Hills and Mount Eagle Special Protection Area 004161" has 81 letters and 6 digits.

List The spellings and locations given in the table are those on the Ordnance Survey's current and historic maps. Three of the top names are at the ruins on Inishmore of the church dedicated of the Four Comely Saints ().

EnglishLettersIrishTypeLocation:county, barony, civil parish, townland Bullaunancheathrairaluinn 25 Bullaun Galway, Aran, Inishmore, Oghil Sruffaunoughterluggatoora 25 Stream Galway, Ballynahinch, Moyrus, Glencoaghan Sruffaungolinluggatavhin 24 Stream Galway, Ballynahinch, Moyrus, Glencoaghan Templeancheathrairaluinn 24 Ruined church Galway, Aran, Inishmore, Oghil Loughaunbarnaheskabaunia 24 Lake Galway, Ballynahinch, Ballynakill, Kylemore Glasheencummeennapeasta Stream 23Glaisín Coimín na Péiste Stream Kerry, Dunkerron North, Knockane, Meallis Leabaancheathrairaluinn 23 Ruined grave Galway, Aran, Inishmore, Oghil Sruffaunloughaunnaveagh 23 Stream Galway, Ballynahinch, Ballynakill, Addergoole Carrickwilliamodonnell 22 Rock Galway, Moycullen, Moycullen, Derryloughaun East Lough Clougherbowbartleymede 22 Loch Chlochar Bó Bhairtliméid Lake Galway, Ballynahinch, Moyrus, Lettershinna CooneenskerragohiffernNot listed in logainm.ie, but named on the Ordnance Survey map: 22 Harbour Mayo, Murrisk, Kilgeever, Lettereeragh Glassillaunvealnacurra 22 (uncertain) Townland Galway, Ballynahinch, Ballindoon & Islands, Glassillaunvealnacurra Illaungraffanavrankagh 22 (uncertain) Townland Clare, Burren, Gleninagh, Illaungraffanavrankagh Loughaunfiddaunbuntack 22 Lake Mayo, Burrishoole, Achill, Srahmore Muckanaghederdauhaulia 22 Townland Galway, Moycullen, Kilcummin, Muckanaghederdauhaulia Drehideenglashanatooha Bridge 22 Droichidín Glas na Tuatha Bridge Tipperary, Middle third, Ardmayle, Camus / Tipperary, Clanwilliam, Ballygriffin, Ballynahinch Mainistirnambratherbeg 22 Ruin Limerick, Clanwilliam, Rochestown, Friarstown Monasternagalliaghduff 22 Ruin Limerick, Shanid, Robertstown, Oldabbey Sruffaunnabolybaunia 22 Stream Galway, Ballynahinch, Ballynakill, Lemnaheltia Ballywinterrourkewood 21 Townland Limerick, Connello Lower, Rathkeale, Ballywinterrourkewood Lough Booroughcummeenauragh 21 Lake Kerry, Magunihy, Killarney, Ullauns / Poulagower Carrickemonmacdonagha 21 Rock Galway, Aran, Inishmore, Brannock Island Carrickmoylenacurhoga 21 Rock Mayo, Erris, Kilmore, Carrickawilt Island Carricknagalliaghduff 21 Rock Mayo, Erris, Kilmore, Duvillaun More (Island) Cloghculliaghfrankagh 21 Rock Galway, Dunkellin, Killeely, Roevehagh Corragunnagalliaghdoo Island 21 Townland Mayo, Burrishoole, Burrishoole, Corragunnagalliaghdoo Island Fiddauntawnynagalloge 21 Stream Mayo, Tirawley, Doonfeeny, Belderg More Glashacummeennagashel Stream 21 Stream Kerry, Dunkerron North, Knockane, Coomcallee Illauncreevnalarragan 21 Island in lake Galway, Moycullen, Killannin, Gortmore Illaunpreaghaunnagark 21 Island in lake Galway, Moycullen, Moycullen, Gortachalla Mullauncarrickscoltia 21 Rock Galway, Ballynahinch, Ballindoon & Islands Ooghinneendonnellduff 21 Inlet Mayo, Erris, Kilmore, Inishkea South Sruffaunbrandraghmore 21 Stream Galway, Ballynahinch, Ballynakill, Cloonlooaun Sruffauneskernaleegha 21 Stream Galway, Ballynahinch, Ballynakill, Kylemore Sruffaunnambrackdeony 21 Stream Galway, Moycullen, Moycullen, Oghery Sruffaunnamuingabalia 21 Stream Mayo, Tirawley, Moygawnagh, Laghtanvack Sruffaunnavonseebegga 21 Stream Galway, Ballynahinch, Moyrus, Glencoaghan Sruffaunrulardheemore 21 Stream Galway, Ballynahinch, Moyrus, Glencoaghan Sruffaunpollnacolmore 21 Stream Galway, Ballynahinch, Ballynakill, Kylemore Sruffaunhullynabaunia 21 Stream Galway, Ballynahinch, Ballynakill, Kylemore Sruffaunscalpnagollum 21 Stream Galway, Ballynahinch, Moyrus, Gleninagh Sruffauntruskanalower 21 Stream Galway, Moycullen, Moycullen, Finisklin / Slieveaneena Ardloughnabrackbaddy 20 Peak Donegal, Kilmacrenan, Tullaghobegly, Tullaghobegly Irish Athwullaghheedonnell Lough 20 Lake Galway, Ballynahinch, Ballindoon & Islands, Slieveburke Bealraghnathreesrugh 20 Minor feature Fermanagh, Magherastephana, Aghalurcher, Altnaponer Carrickacushcamemore 20 (uncertain) Rock Mayo, Murrisk, Kilgeever, GarrantyOn Inishturk. Carrickbriendurragha 20 Rock Donegal, Boylagh, Templecrone, Braade Carrickillaunnascalp 20 Rock Galway, Moycullen, Kilcummin, Derravonniff Carricknagalliaghdoo 20 Rock Mayo, Burrishoole, Achill, Doogort West Carrigeenmoylenanagh 20 Rock Mayo, Erris, Kilmore, Inishkea South Carrigfoilaphreesoon 20 Rock Cork, Carbery West (W.D.), Kilmoe, Dunlough Carrigillaunyrahilly 20 Rock Kerry, Dunkerron South, Kilcrohane, Coomatloukane Carrowkeelanahaglass 20 Townland Galway, Ballymoe, Dunmore, Carrowkeelanahaglass Cartroncarrowntogher 20 (uncertain) Townland Roscommon, Frenchpark, Kilmacumsy, Cartroncarrowntogher Coosfohermarenabinia 20 Cove Kerry, Corkaguiny, Garfinny, Beenbane Crockballaghnagrooma 20 Hill Tyrone, Omagh East, Termonmaguirk, Sluggan Cummernabarnadarriga Glen 20 Valley Kerry, Iveragh, Glanbehy, Carriginane/Neesha Foildermotycronacane 20 Cliff Cork, Carbery West (East Division), Clear Island, Ballyieragh South Gubpaudeenshaneneese 20 Headland Mayo, Burrishoole, Achill, Derreen Lisheennagranshymore 20 Ancient burial ground Galway, Leitrim, Duniry, Grange More Knockaunshaunmaconry 20 Hill Galway, Moycullen, Kilcummin, Callownamuck Knockavanniamountain 20 Townland Waterford, Glenahiry, Seskinan, Knockavanniamountain Lackshivaunnageelagh 20 Minor feature Kerry, Corkaguiny, Dingle, Emlagh East Mallgarveheamushwaun 20 Island Galway, Ballynahinch, Ballindoon & Islands, Leaghcarrick / Ballyconneely Minnaunballyconneely 20 Móinín Baile Conghaile Skerry Galway, Ballynahinch, Ballindoon & Islands, Bunowen Beg Monasterkieran or Monasterconnaughtagh 20 Ruined church Galway, Aran, Inishmore, Oghil Newtownmoneenluggagh 20 (uncertain) Townland Kildare, Ikeathy and Oughterany, Scullogestown Poulillaundonaghbane 20 Island Kerry, Iveragh, Dromod, Kealafreaghane West Scartnadrinymountain 20 Townland Waterford, Decies-without-Drum, Kilgobnet, Scartnadrinymountain Sruffaungortarusheen 20 Stream Galway, Ballynahinch, Ballynakill, Kylemore Sruffaunmaumnavonsee 20 Stream Galway, Ballynahinch, Moyrus, Glencoaghan Sruffaunlugganaffrin 20 Stream Galway, Ballynahinch, Omey, Aillenaveagh Sruffaunmuinganierin 20 Stream Mayo, Tirawley, Kilfian, Shanettra /Mayo, Tirawley, Moygawnagh, Corvoley Sruhauncloghacappeen 20 Stream Mayo, Murrisk, Kilgeever, Derreennanalbanagh Stookalargachuitread 20 Sea stack Donegal, Kilmacrenan, Clondavaddog, Doagh Beg Tobernashaghtninneen 20 Holy well Galway, Ross, Ross, Munterowen East

Notes:

Variant, historical, and spurious spellings John O'Donovan recommended "Illaunloughmorenavreaghoge" (26 letters) as the name of an island in "Loughnavreeghougue" in Clynagh townland, Killannin parish, Moycullen barony, County Galway. He noted "Illaunloughmorenavreeghougue" (28 letters) as the local spelling. However, the Ordnance Survey went with "Lough Morenavreaghoge" for the lake, and left the island unnamed, while the Irish Placenames Database gives the name "Illaunmore" for an island in Clynagh.

Two lakes called "Loughs Nahaskanabaunia" on the Ordnance Survey map correspond to the entry "Loughsnahaskanabaunia" (21 letters) in the Placenames Database. The townland of Brackagh Slieve Gallion in County Londonderry has sometimes been written as one 21-letter word, Brackaghslievegallion, or similar. Similarly, Lisbellanagroagh More in County Antrim has been written Lisbellanagroaghmore (20 letters).

An 1829 calendar of Stuart patent rolls in the Irish Chancery includes Knockatoodreknocknynuyshaneboye (31 letters) and Aghannyquillaknockacarnoc (25 letters) from 1611 as subdenominations within "Gortnemureknock" (now Gortinure and Knocks; ) County Fermanagh;Commissioners of Public Records in Ireland, Fermanagh 8 Jas. I; Grangeballaghmarramacquoid (26 letters) in Armagh in 1616;Commissioners of Public Records in Ireland, Armagh 4 Jac. I and Ballylirstrillyvickenratty (26 letters) for Tullymacarath, County Down in 1609. The spelling Ballemickegillemorreyietragh (28 letters; later "Ballymackilmurry etra" in the townland of Ballymackilmurry) is recorded in a 1609 inquisition into the churchlands of County Armagh made in preparation for the Plantation of Ulster. Salters Grange, County Armagh is called Grangeballaghmarramacquoid (26 letters) in inquisitions of 1557 and 1614. The 1654 Civil Survey of County Tipperary records Glayshlackeenetanballyuore (26 letters) as the name of a "small brooke" forming part of the boundary of Oughterleague parish by the townland of Demone; Aghknockanecurryheeneliegh (26 letters) a ford on the boundary of Moyne parish in Tipperary; and Barrecoroughbollinbraykon (25 letters) a "littel stream" on the border of Gorey barony. A place named Caherhewlissingaberrighe (24 letters) in Galway or Roscommon is mentioned in a 1578 fiant. An 1825 index of placenames in the decrees of innocence registered under the Act of Settlement 1662 includes Gortecoleighshraghmicknuckgenny (31 letters), Ballynygorenagheyannyneaghe (27 letters) and Laghirtydonellanknockane (24 letters).

The Placenames Database of Ireland includes an entry for "Lougheroaghballaghdown" (22 letters), apparently a misspelt duplicate of "Lough Croaghballaghdown". An 1824 return of townlands in Mayo includes one of 48 acres in the parish of "Torlogh" (now Turlough), barony of Carra, named "Knockballymackellygirrenane [27 letters] Tully". This is a mistranscription of "Knockballymackelly, Grenane, and Tully[quirke]", now the townland of Greenans.

See also Place names in Ireland List of long place names Two Irish towns with 19-letter names: Newtownmountkennedy Castletownbere, sometimes called Castletownberehaven

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