Rafael J. Díaz (born December 12, 1970) is a Mexican professional baseball pitcher who is a free agent.
Díaz attended high school in Bayamón, Puerto Rico.
The Cincinnati Reds selected Díaz in the ninth round of the 1989 MLB Draft.
He pitched for the Seibu Lions of Nippon Professional Baseball in 2000.
This biographical article relating to a Mexican baseball pitcher is a stub.