1998–99 Iowa State Cyclones men's basketball team

1998–99 Iowa State Cyclones men's basketball
ConferenceBig 12 Conference
Record15-15 (6-10 Big 12)
Head coach
Assistant coaches
Home arenaHilton Coliseum
1998–99 Big 12 men's basketball standings
Conf. Overall
Team W   L   PCT W   L   PCT
Texas 13 3   .813 19 13   .594
Missouri 11 5   .688 20 9   .690
No. 22 Kansas 11 5   .688 23 10   .697
Oklahoma 11 5   .688 22 11   .667
Oklahoma State 10 6   .625 23 11   .676
Nebraska 10 6   .625 20 13   .606
Kansas State 7 9   .438 20 13   .606
Colorado 7 9   .438 18 15   .545
Iowa State 6 10   .375 15 15   .500
Texas A&M 5 11   .313 12 15   .444
Texas Tech 5 11   .313 13 17   .433
Baylor 0 16   .000 6 24   .200
1999 Big 12 Tournament winner
Rankings from AP poll

The 1998–99 Iowa State Cyclones men's basketball team represented Iowa State University during the 1998–99 NCAA Division I men's basketball season. The Cyclones were coached by Larry Eustachy, who was in his 1st season. 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. Iowa State hired Utah State head coach Larry Eustachy to replace him.

They finished the season 15–15, 6–10 in Big 12 play to finish in 9th place. They lost to Colorado in the first round of the Big 12 Conference tournament.