1998–99 Ohio State Buckeyes men's basketball team

The 1998–99 Ohio State Buckeyes men's basketball represented Ohio State University during the 1998–99 NCAA Division I men's basketball season. It was the Buckeyes’ first season at the new 19,500-seat Value City Arena in Columbus, Ohio, which replaced their previous stadium, St. John Arena. Led by second-year head coach Jim O'Brien, the Buckeyes finished 27–9 (12–4 Big Ten) and reached the Final Four of the NCAA tournament. However, the NCAA vacated the team's Final Four appearance and adjusted their record to 1-1 due to the Jim O’Brien scandal.

Schedule and results
!colspan=9 | Regular season

!colspan=9 | Big Ten Tournament

!colspan=9 | NCAA Tournament