Rahinnane Castle is a tower house and National Monument located in County Kerry, Ireland.

[2][3] Rahinnane Castle is located 1.73 km (1.07 mi) northwest of Ventry, in the west of the Dingle Peninsula.

Local tradition once claimed that this piece of land was the last in Ireland held by the Vikings, as it was so easily defended.

[7][8] The ancient earthwork featured a 9 metres (30 ft) deep ditch, an entrance in the southwest and a souterrain in the southeast.

Most of the outer walls remain; on the inside there is some mural stairway, traces of vaulting and a blind arcade.