List of monastic houses in County Monaghan
| Foundation | Image | Communities & provenance | Formal name or dedication & alternative names |
| Carrickmacross Monastery | early monastic site, founded before 845 | Cell-rois; Feara-rois | |
| Clochensis Friary ~≈? | Augustinian Friars possibly Clones former house of Augustinian Canons ' | Clockensis; Clochensis in Connacht; Clones | |
| Clones Abbey | early monastic site, Gaelic monks, founded before 549/50 by St Tigernach Augustinian Canons Regular founded after 1140? Augustinian Canons Regular — Arroasian? reformed c.1144?; dissolved after 1586?; granted to Sir Henry Duke possibly later Augustinian Friars | SS Peter and Paul St Tighernach ____________________ 'St Tierney' ; Wee Abbey; Cluain-eois; Cluan-auis; Clunes; Cluniscense; Clokensis? | |
| Clontibret Monastery | early monastic site, Gaelic nuns, patronised by St Colman; termon land 1591 | Cluain-tiprat | |
| Connabury Monastery | early monastic site, Gaelic nuns, founded before 740 | Gort-chonaigh | |
| Donagh Monastery | early monastic site, Gaelic monks; erenagh 1542 | Domnachmaighe-da-chlaoine; Dumthomuach | |
| Donaghmoyne Monastery | early monastic site, founded by St Patrick; plundered by Norsemen 832 | Domnach-maigen | |
| Drumsnat Monastery | early monastic site, patronised by St Molua | Druim-snechta | |
| Errigal Trough Monastery | early monastic site, Gaelic monks | Airecal-muadain | |
| Inniskeen Monastery | early monastic site, founded before 587; burned 789; plundered 948; possibly not surviving after 10th century; burned 1166 | Inis-cain-dega; Inis-kin; Innishkeen | |
| Killeevan Abbey ~ø | supposed monastic site — order and period unknown; remains of "Abbey" church — possibly legendary | ||
| Kilmore Monastery ~ | early monastic site burned 749 | St Aedan ____________________ Cell-mor of Aedan | |
| Loughbawn Abbey | purported "Abbey" site | ||
| Monaghan Friary = | Franciscan Friars Minor, Conventual founded 1462 on the site of the early monastery '; Observant Franciscan Friars reformed 1567; dissolved 1588-9, destroyed by the English 1589; granted to Edward Withe; fortified mansion built from the friary masonry by Lord Edward Blarney | Muinechan; Muineachan; Mounechan; Munichane | |
| Monaghan Monastery | early monastic site Franciscan friary built on site 1462 ' | Muinechan; Muineachan; Mounechan; Munichane | |
| Muckno Monastery | early monastic site, Gaelic monks; plundered by the Ulidians 1110; claimed by Augustinian Friars 17th to 19th century | Mucnamh; Muck Naimh; Mucshnamh; Muckna; Muckne | |
| Tehellan Monastery | early monastic site, Gaelic monks founded 5th century by St Patrick | Tech-talan; Tech-talain; Tyhallan; Tyholland | |
| Tedavnet Monastery | early monastic site, Gaelic nuns founded 6th century by St Damhnat | Tech-damnata; Tydavnet | |
| Tullycorbet Monastery | early monastic site | Tullach-carpait |
The following location in County Monaghan lacks monastic connection:
- Clones 'Abbey': a ruined non-monastic church