St Nathy's College is a Catholic secondary school in Ballaghaderreen in County Roscommon, Ireland.

The Diocese purchased Ballaghaderreen Military Barracks from the War Office, and the School moved there in 1896.

St. Nathys amalgamated with St. Josephs Convent (Sisters of Charity) becoming a co-educational school, it also amalgamated with the local Ballaghaderreen VEC school 2010 saw the celebration of 200 years of the college, St Nathy’s 1810 to 2010, Reflections and Memories of Past Pupils, edited by Fr.

[2] St. Nathy's was accused by an RTÉ Prime Time Investigates programme of falsifying student numbers to inflate food grants.

No prosecution was sought due to "insufficient evidence", and St. Nathy's repaid the Department of Social Protection about €646,000.