The 5-9, 185-pound athlete is the son of former Buckeye running back and two-time Heisman Trophy winner Archie Griffin. The university lists Adam as a running back, defensive back and return specialist.
"Adam Griffin has a passion to be an Ohio State Buckeye," head coach Jim Tressel said in a statement. "He will add a great deal to our football family on the field, in the locker room and on our campus. Adam clearly understands the privilege of being an Ohio State Buckeye."
His addition could mean that the Buckeyes no longer think they have a shot at five-star offensive tackle Seantrel Henderson. The nation's top prospect chose USC on signing day but did not sign with the university because he is waiting to see the outcome of an NCAA investigation into the program.
Tressel has indicated that this year's class could stretch as high as 20 members and that he would wait on Henderson's final decision. Finishing with less than that number would allow the coach to award a scholarship or two to walk-on athletes this season.
Last week, an OSU spokesperson said the Buckeyes had just one scholarship offer still on the table.
Check back with BuckeyeSports.com later for more information on the newest Buckeye.