| Year: | 2018–19 |
| Team: | Ohio State Buckeyes |
| Sport: | Basketball |
| Conference: | Big Ten Conference |
| Short Conf: | Big Ten |
| Record: | 20–15 |
| Conf Record: | 8–12 |
| Hc Year: | 2nd |
| Ac1 Year: | 2nd |
| Ac2 Year: | 2nd |
| Ac3 Year: | 2nd |
| Tourney Result: | Second Round |
The 2018–19 Ohio State Buckeyes men's basketball team represented Ohio State University in the 2018–19 NCAA Division I men's basketball season. Their head coach was Chris Holtmann, in his second season with the Buckeyes. The Buckeyes played their home games at Value City Arena in Columbus, Ohio as members of the Big Ten Conference. The Buckeyes finished the season 20–15, 8–12 in Big Ten play to finish in a tie for eighth place. As the No. 8 seed in the Big Ten tournament, they defeated Indiana in the second round before losing to Michigan State in the quarterfinals. They received an at-large bid to the NCAA tournament as the No. 11 seed in the Midwest region. There they upset Iowa State in the First Round before losing to Houston in the Second Round.
The Buckeyes finished the 2017–18 season 25–9, 15–3 in Big Ten play to finish in a tie for second place. As the No. 2 seed in the Big Ten tournament, they lost to Penn State in the quarterfinals. They received an at-large bid to the NCAA tournament as the No. 5 seed in the West region. They defeated South Dakota State in the First Round before losing to Gonzaga in the Second Round.
| Name | Number | Pos. | Height | Weight | Year | Hometown | Reason for departure | |
|---|---|---|---|---|---|---|---|---|
| 0 | C | 6'9" | 240 | Transferred to Wisconsin | ||||
| 1 | F | 6'4" | 230 | Graduated | ||||
| 13 | G | 6'2" | 190 | Graduated | ||||
| Kam Williams | 15 | G | 6'2" | 185 | Graduated | |||
| 33 | F | 6'7" | 235 | Declared for 2018 NBA draft; selected 48th overall by the Minnesota Timberwolves | ||||
| Matt Lehmann | 43 | G | 6'4" | 205 | Graduated | |||
| Connor Fulton | 45 | G | 6'4" | 175 | Professionalized in Japan |
| Name | Number | Pos. | Height | Weight | Year | Hometown | Previous School | |
|---|---|---|---|---|---|---|---|---|
| 13 | G | 6'1" | 195 | Junior | Florida State | |||
| 32 | G | 6'3" | 205 | Graduate Student | Wake Forest |
|-!colspan=9 style=| Exhibition|-!colspan=9 style=| Regular season|-!colspan=9 style=|Big Ten tournament|-!colspan=9 style=|NCAA tournament
See also: 2018–19 NCAA Division I men's basketball rankings. ^Coaches Poll did not release a Week 2 poll at the same time AP did.
*AP does not release post-NCAA Tournament rankings