This is a list of the 32 Counties of Ireland by their highest point. 10 Counties share the same highest point so there are only 27 mountains listed.
A Mountain which is the highest point in two different counties has a *
Counties in the Republic of Ireland are shown in normal type, while those in Northern Ireland and listed in italic type.
| Rank | County | Mountain peak | Elevation | Overall Irish Rank |
|---|---|---|---|---|
| 1 | Kerry | Carrauntoohil | 1,038 m (3,406 ft) | 1st |
| 2 | Wicklow | Lugnaquilla | 925 m (3,035 ft) | 13th |
| 3 | Limerick | Galtymore* | 919 m (3,015 ft) | 14th |
| 3 | Tipperary | Galtymore* | 919 m (3,015 ft) | 14th |
| 5 | Down | Slieve Donard | 850 m (2,790 ft) | 19th |
| 6 | Mayo | Mweelrea | 814 m (2,671 ft) | 34th |
| 7 | Carlow | Mount Leinster* | 796 m (2,612 ft) | 44th |
| 7 | Wexford | Mount Leinster* | 796 m (2,612 ft) | 44th |
| 9 | Waterford | Knockmealdown | 794 m (2,605 ft) | 45th |
| 10 | Dublin | Kippure | 757 m (2,484 ft) | 73rd |
| 11 | Donegal | Mount Errigal | 751 m (2,464 ft) | 76th |
| 12 | Galway | Benbaun | 729 m (2,392 ft) | 89th |
| 13 | Cork | Knockboy | 706 m (2,316 ft) | 104th |
| 14 | Londonderry | Sawel Mountain* | 678 m (2,224 ft) | 144th |
| 14 | Tyrone | Sawel Mountain* | 678 m (2,224 ft) | 144th |
| 16 | Cavan | Cuilcagh* | 665 m (2,182 ft) | 165th |
| 16 | Fermanagh | Cuilcagh* | 665 m (2,182 ft) | 165th |
| 18 | Sligo | Truskmore | 647 m (2,123 ft) | 201st |
| 19 | Leitrim | Truskmore Cairn | 631 m (2,070 ft) | 229th |
| 20 | Louth | Slieve Foy | 589 m (1,932 ft) | 299th |
| 21 | Armagh | Slieve Gullion | 573 m (1,880 ft) | 323rd |
| 22 | Antrim | Trostan | 551 m (1,808 ft) | 361st |
| 23 | Clare | Moylussa | 532 m (1,745 ft) | 390th |
| 24 | Laois | Arderin* | 527 m (1,729 ft) | 399th |
| 24 | Offaly | Arderin* | 527 m (1,729 ft) | 399th |
| 26 | Kilkenny | Brandon Hill | 515 m (1,690 ft) | 425th |
| 27 | Roscommon | Seltannasaggart | 422 m (1,385 ft) | 699th |
| 28 | Kildare | Cupidstown Hill | 379 m (1,243 ft) | 872nd |
| 29 | Monaghan | Slieve Beagh | 373 m (1,224 ft) | 878th |
| 30 | Longford | Carn Clonhugh | 278 m (912 ft) | 980th |
| 31 | Meath | Slieve na Calliagh | 276 m (906 ft) | 982nd |
| 32 | Westmeath | Mullaghmeen | 261 m (856 ft) | 1,001th |