Templenagalliaghdoo is a medieval church and National Monument in County Mayo, Ireland.

Templenagalliaghdoo is located on a peninsula stretching into Lough Conn, immediately to the north of Errew Abbey.

[1] The name means "Church of the Black Nun.

Templenagalliaghdoo is a small rectangular building with walls 50 cm thick and an entrance in the southwest, surrounded by a dry stone wall enclosure (17 × 23 m).

This article related to the geography of County Mayo, Ireland is a stub.