1984 NCAA Division II baseball tournament

The 1984 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 1984 NCAA Division II baseball season.

For the fifth year, the tournament was played at the Riverside Sports Complex in Riverside, California.

Cal State Northridge defeated Florida Southern, 10–5, in the second game of the championship series of the double-elimination tournament, capturing the Matadors' second national title and first since 1970 (as San Fernando Valley State). Cal State Northridge was coached by Bob Hiegert.