Big Four Conference (Oklahoma)
The Big Four Conference was an intercollegiate athletic conference that existed from 1929 to 1932. Its membership was centered on the state of Oklahoma.
Former members
| Institution | Location | Founded | Nickname | Current Conference |
| Oklahoma Baptist University | Shawnee, Oklahoma | 1910 | Bison | Great American |
| Oklahoma City University | Oklahoma City, Oklahoma | 1904 | Goldbugs | Sooner |
| Phillips University | Enid, Oklahoma | 1906 | Haymakers | Closed in 1998 |
| University of Tulsa | Tulsa, Oklahoma | 1894 | Tulsa Golden Hurricane | American Athletic |
; Notes
Football champions
- 1929 – Tulsa
- 1930 – Tulsa
- 1931 – Oklahoma City
- 1932 – Tulsa