Holy Trinity Catholic High School is accredited by the Texas Catholic Conference Education Department (TCCED) which is a department of the Texas Catholic Conference of Bishops and receives its accrediting authority from the Texas Education Agency (TEA).   It has also met the requirements established by the AdvancED Accreditation Commission and is accredited by the Southern Association of Colleges and Schools Council on Accreditation and School Improvement.

MEMBERSHIPS:
National Catholic Education Association
Texas Association of Private & Parochial Schools