The 1989 NCAA Division II baseball tournament was the postseason tournament hosted by the NCAA to determine the national champion of baseball among its Division II colleges and universities at the end of the 1989 NCAA Division II baseball season.
The final, eight-team double-elimination tournament was played at Paterson Field in Montgomery, Alabama.
Initially, Cal Poly San Luis Obispo defeated New Haven, 9–5, in the final, claiming the Mustangs' first Division II national title. However, Cal Poly's participation was later vacated and the title was not rewarded.