D
- Dalgan Flu, arm.
- Dendough Carrick, ant.
- Lough Der, down.
- Derrie, dun.
- Derrie Fort, dun.
- Desert, Neth. Tyr.
- Devenish, Ferm.
- Dirgh Castle, dun.
- Dirgh Flu, dun.
- Lough Dirgh, or Saint Patrickes Purgatory, dun.
- Dirrey, down.
- Lough Disart, Nether Tyrone.
- Disart Crygh, Nether Tyrone.
- Mac Dogevene, Col.
- Doh. Arnbery. ant.
- Dole, Neth. Tyr.
- Donanerony, ant.
- Donaneny Castle, ant.
- Fort Donat, Nether Tyr. O.
- Lough Donat, Nether Tyr. O.
- DONDALKE, Lough.
- Dondrom bay, down.
- Donegall Monast, dun.
- Kill Donel, dun.
- Donelong, Vpper Tyr.
- Donenany point, Lough.
- Doneregy, arm.
- Donglas, Nether Tyr.
- Donhalieing, ant.
- Donegalke, Lough.
- Temple Donocave, Vpper Tyr.
- Donohelon, down.
- Donogh, Upper Tyr.
- Donoghiddy, Vpper Tyr.
- Slu Donogh, Col.
- Donoghs inragh, Nether Tyrone.
- Donogmore, down.
- Donomaw, down.
- Donomore, dun.
- Donmory, ant.
- Donomurke, Neth. Tyr.
- Knock Donoshery, Col.
- Temple Donrath, Vpper Tyr.
- Donroe, ant.
- Dony, Monagh.
- Dony, down.
- Dornous, arm.
- The Dorterey, Cavan.
- Dougharty, dun. O.
- Downoman, down.
- Mac Sul Downe, down.
- Droghdagh haven, Long.
- DROGHDAGH, Lou.
- Dromebaly, down.
- Dromemarke, ant.
- Dromore, down.
- Dromshallen, Lough.
- Dronecan, Lough.
- Drumboe, Neth. Tyr.
- Drumboe, Neth. Tyr.
- Dundalke haven, Lough.
- DVNGAL, dun.
- Dungall haven, dun.
- Dungannon, Neth. Tyr.
- Dunluce Castle, ant.
- Dunmore, Lough.
- Dunseeke, ant.
- Lough Dunuare, ant.