Mitchell, a five-star prospect out of Plano (Tex.) Prestonwood, committed to Thad Matta and his staff on Thursday. Mitchell's brother is a freshman linebacker on the football team.
"Mickey is 100 percent a Buckeye," Ken Mitchell told Scout.com about his son.
Joining his brother was always something that the younger Mitchell wanted to do, and on his unofficial visit he decided to pull the trigger.
"Mickey called me earlier and was discussing the plusses and minuses," said the elder Mitchell. "I just told him it was his decision and he had to do what was best for him. Obviously he felt Ohio State was the right place."
At 6-foot-8, 245-pounds, Mitchell is a hard playing power forward. He gets after it on the glass, is active on both ends and likes to face the rim for scoring opportunities. Mitchell missed his sophomore season due to a torn ACL injury.
Ohio State now has a pair of commits in their 2015 recruiting class. Mitchell joins Dayton (Ohio) Dunbar lead guard A.J. Harris to make up their current class.
Mitchell is currently ranked No. 15 overall in the 2015 class.
Brian Snow and Evan Daniels contributed to this report