St. Lassara’s N.S. was built on a site adjoining the old school (now the local Community Centre) which was built in 1887. St. Lassara was sister of St. Nathy and mother of St. Fechin. She lived in Killasser which means the Church of Lassara.

St. Lassara’s N.S. was built in 1951 and 1952, Mr. Sean Devaney, R.I.P. and Ms Mae O’Donnell moved from the old school to teach there. Mr. Devaney was Principal and he taught 3^rd to 6^th Classes while Ms O’Donnell taught Infants to 2^nd Class. All subjects were taught through Irish by order of the Department of Education. Both of these teachers worked happily together for almost twenty years when Mr. Devaney retired. Ms. O’Donnell was Acting Principal for the following year.

At this time, there were 6 schools in the Ballinacarrow end of the parish. On Mr. Devaney’s retirement the Department of Education decided to close 3 of them. Pupils of Lisaneena moved to St. Lassara’s N.S. with Mr. Tommie Kilcoyne and his assistant Mrs. Eileen Tighe. Pupils from Lackagh were sent to Collooney with their teacher and pupils from Kinnegrelly were also sent to Collooney but their Principal Mrs. Breege O’Donoghue cane to Ballinacarrow. In order to accommodate the new pupils and teachers, a tow-roomed chalet was erected at the back of the school. Central heating and flush toilets and wash hand basins were installed and a small teachers room and boiler house were built on.