St. Mary's Catholic School is a private Roman Catholic PreK thru High School in Longview, Texas.

It is located in the Roman Catholic Diocese of Tyler.

St. Mary's Catholic School students compete in Soccer, Volleyball, Softball, Track, Cross Country, Golf, and Tennis [added 2020] through the Texas Association of Private and Public School (TAPPS).

St. Mary's Catholic School students also compete in Archery through National Archery In The Schools Program (NASP).

St. Mary's Catholic School students can compete in TAPPS academics, and TAPPS art.