The Irish state has officially approved the following list of national monuments in County Cavan. In the Republic of Ireland, a structure or site may be deemed to be a "national monument", and therefore worthy of state protection, if it is of national importance. If the land adjoining the monument is essential to protect it, this land may also be protected.
National Monuments
edit| NM# | Monument name | Description | Image | Townland | Location |
|---|---|---|---|---|---|
| 585 | Cabragh Ringfort | Ringfort |  | Cabragh | 54°03′14″N 7°06′32″W / 54.053887°N 7.109°W |
| 456 | Cohaw | Court Tomb |  | Cohaw | 54°03′27″N 7°01′05″W / 54.05738°N 7.01814°W |
| 4 | Drumlane | Church & Round Tower |  | Drumlane | 54°03′29″N 7°28′43″W / 54.05819°N 7.47872°W |
| 585 | Errigal Ringfort | Ringfort | _(geograph_2511547).jpg) | Errigal | 54°03′57″N 7°06′12″W / 54.065817°N 7.103348°W |
| 570 | Gartnanoul | Court Tomb |  | Gartnanoul | 54°00′37″N 7°29′32″W / 54.01038°N 7.49210°W |
| 602 | Cloughoughter Castle | Castle |  | Inishconnell | 54°01′07″N 7°27′17″W / 54.01871°N 7.45485°W |
| 616 | Lisnagowan Ringfort | Ringfort | Lisnagowan | 54°03′32″N 7°18′14″W / 54.058911°N 7.303790°W |