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Prior to the 1958 season, Oklahoma A&M, now Oklahoma State, rejoined the Big Seven Conference, which then became known as the Big Eight.
Conference winners
This is a partial list of conference champions from the 1958 season. Each of the eight geographical districts chose, by various methods, the team that would represent them in the NCAA tournament. 13 teams earned automatic bids by winning their conference championship while 14 teams earned at-large selections.
The 1958 season marked the twelfth NCAA Baseball Tournament, which culminated with the eight team College World Series. The College World Series was held in Omaha, Nebraska. The eight teams played a double-elimination format, with Southern California claiming their second championship with an 8–7 win over Missouri in the final.