Arigna (Irish: An Airgnigh, formerly Arigneach) is a village in County Roscommon, Ireland. It is near Lough Allen (on the Shannon-Erne Waterway), on a designated "scenic route" between Keadue and Sliabh an Iarainn.Arigna is situated in Kilronan Parish alongside the fellow picturesque villages of Keadue and Ballyfarnon.The village lies close to the shores of Lough Allen.The village has a long association with the mining industry.