McDermott's Castle
| McDermott's Castle | |
|---|---|
| Native name Carraig Mhic Dhiarmada (Irish) | |
| The Rock MacDermot's Castle Carrick McDermott | |
| Type | Castle |
| Location | Castle Island, Lough Key, County Roscommon, Ireland |
| Coordinates | 53°59′22″N 8°13′57″W / 53.989522°N 8.232580°W |
| Official name | McDermott's Castle (Castle Island) |
| Reference no. | 586 |
McDermott's Castle is a castle and protected national monument located in County Roscommon, Ireland. The site of a fortification since at least the 13th century, the structure's tower house may date from the 16th century, with much of the current building (including its crenellations) dating to the 19th century.