St. Mary's Catholic College Casino is a co-educational Catholic secondary school in Casino, New South Wales, Australia. It was founded by the Marist Brothers in 1946. In a list published in 2017 by the New South Wales Board of Studies as one of the 888 schools in the state with the best Higher School Certificate performance. The college was in 560th place down from 396th in the previous year.
Enrolment is approximately 368 students.
In 2016, St. Mary's team took first place in the Australian Youth Rocketry Challenge. In 2017 the school was allotted a place on the Australian and New Zealand Army Corps memorial tour.