St. Crumnathy's Cathedral Achonry,[1][2] is a former cathedral[3] in the Republic of Ireland.

[4] Dedicated to St Nathy,[5] it was formerly in the Diocese of Achonry,[6] and then the joint cathedral of Killala and Achonry.

[7] It was rebuilt in 1823 at a cost of £1066 with a grant from the Board of First Fruits.

[8] It was then one of three cathedrals in the Diocese of Tuam, Killala and Achonry until it was deconsecrated in 1998.

[9] It is now a protected structure.