The school takes its name from Archbishop M.C. O'Neill who was a positive force in bringing about Catholic secondary education in the Archdiocese of Regina.
Archbishop M.C. O'Neill High School opened in the fall of 1966 with an enrolment of 250 students and a staff of 26. Presently our enrolment is approximately 1,000 students with a staff of 53. An addition in 1976 of 4 portable classrooms in 1990 has expanded the present facility to cover over 100,000 square feet. In addition to the traditional educational programs, O'Neill offers a French Immersion Program, and an Advanced Placement Program.