Lynn Stevens has served in the role for about three weeks, though the new Republican governor's office made the announcement Tuesday.
It comes as Kasich has taken heat from minority state lawmakers who say he has not done enough to diversify his top staff.
Kasich's cabinet appointees so far are all white, a first for the state since 1962.
The governor's office says Stevens -- who is African American -- will act as a liaison to Ohio's minority communities. Her position is not cabinet-level.
Kasich has said he's focused on putting together "the best possible team" without regard for race, gender, ethnicity or sexual orientation.
The Associated Press