St Mary's Knockbeg College (Irish: Coláiste Muire Cnoc Beag) is a Roman Catholic, all-boys secondary school located on the Laois/Carlow border in Ireland, approximately 3 km from both Carlow town and Graiguecullen, County Laois.

[1] St Mary's Knockbeg College is one of the oldest secondary schools in Ireland, located on the Laois/Carlow border.

It traces its origins back to 1793 when a lay school for boys was established in St.Patrick's College, Carlow in conjunction with the seminary there.

This includes past students Donal Kingston, Brian McDonald, Ross Munnelly and Rory Stapleton.

[citation needed] In addition, Laois captain Stephen Attride has taught physical education and science at the school.