The 1998 Ohio State Buckeyes football team represented the Ohio State University in the 1998 NCAA Division I-A football season. The team's head football coach was John Cooper. The Buckeyes played their home games in Ohio Stadium. The team finished the season with a win-loss record of 11–1, and a Big Ten Conference record of 7–1. They were co-champions of the Big Ten Conference with the Wisconsin Badgers and the Michigan Wolverines and played in one of the premiere Bowl Championship Series bowl games, the 1999 Sugar Bowl.
Led by senior quarterback Joe Germaine, the Buckeyes were the preseason number one team and remained top-ranked throughout the majority of the season. The Buckeyes only loss came late in the season to the Michigan State Spartans. The team blew a 15-point lead late in the game to fall 28–24.
Because of the late loss, Ohio State was kept out of the National Championship Game, the 1999 Fiesta Bowl. Their regular season "miss" of not playing fellow tri-champion Wisconsin also cost the Bucks a trip to the 1999 Rose Bowl because Ohio State was the last to play in the Rose Bowl in 1997, Wisconsin last played in 1994.
The Buckeyes beat Texas A&M in the Sugar Bowl to finish second in both polls behind the Tennessee Volunteers after their victory over Florida State in the Fiesta Bowl.