The 1948 Division I Baseball Tournament was the second NCAA sanctioned baseball tournament that determined a national champion. The University of Southern California would go on to win the championship, their first of 12 championships.

Tournament

The tournament was divided into two regional brackets, the Eastern Playoff and the Western Playoff. Unlike the previous year, this year's tournament was double-elimination.

The Eastern Playoff bracket consisted of:

• (3-0)
• (2-2)
• (1-2)
• (0-2)

The Western Playoff bracket consisted of:

• (3-0)
• (2-2)
• (1-2)
• (0-2)

Yale won the Eastern Playoff bracket with a record of 3-0. Southern California won the Western Playoff bracket, also with a record of 3-0. Each team moved on to the 1948 College World Series, played at Hyames Field in Kalamazoo, Michigan in a best of three game series.