Achonry (/æˈkɔːnriː/; Irish: Achadh Conaire, meaning 'Conaire's field') is a village in County Sligo, Ireland. The old name is Achad Cain Conairi. St. Nath Í ua hEadhra (O'Hara) founded a monastery here. The foundation gave the later diocese its name. The monastery was founded on land granted by the Clan Conaire. Nath Í was the teacher of St. Féichín of Ballysadare. The village is in a townland and civil parish of the same name.

The diocese was co-extensive with the barony of Leyney (Luighne).

In the parish is the former Church of Ireland Cathedral of St Crumnathy, now deconsecrated. The title, Bishop of Achonry, takes its name from the village, and has been used by bishoprics in both the Roman Catholic Church and Church of Ireland.

• List of towns and villages in Ireland

• Feardorcha Ó Conaill (1876–1929), writer and former rector of Achonry.

• Official Website of Catholic Diocese of Achonry