1998–99 Iowa State Cyclones men's basketball team

They played their home games at Hilton Coliseum in Ames, Iowa and competed in the Big 12 Conference.

At the conclusion of the season head coach, Tim Floyd accepted the same position with the Chicago Bulls of the NBA.

[4] After several seasons of courting the Chicago Bulls of the NBA hired Iowa State's Tim Floyd to replace Phil Jackson as head coach.

[9] Iowa State signed West Virginia Wesleyan transfer Dewayne Johns in the off season.

[10] Kantrail Horton transferred into the program mid-season from Middle Georgia JC but coach Eustacy elected to have him red-shirt to preserve his full two years of eligibility.