| Year: | 2018–19 |
| Team: | Iowa State Cyclones |
| Sport: | Basketball |
| Conference: | Big 12 Conference |
| Short Conf: | Big 12 |
| Coachrank: | 25 |
| Aprank: | 24 |
| Record: | 23–12 |
| Conf Record: | 9–9 |
| Hc Year: | 4th |
| Asst Coach1: | James Kane |
| Champion: | Big 12 tournament champions |
| Tourney Result: | first round |
The 2018–19 Iowa State Cyclones men's basketball team represented Iowa State University during the 2018–19 NCAA Division I men's basketball season. The Cyclones were coached by Steve Prohm, who was in his fourth season at Iowa State. They played their home games at Hilton Coliseum in Ames, Iowa as members of the Big 12 Conference. They finished the season 23–12, finishing in 5th place. In the Big 12 tournament, they defeated Baylor, Kansas State and Kansas to win the Big 12 championship. They received an automatic bid as a 6th seed in the NCAA tournament where they were upset by 11th seed Ohio State in the first round.
The Cyclones finished the 2017–18 season 13–18, 4–14 in Big 12 play, to finish in last place. They lost in the first round of the Big 12 tournament to Texas.
| Name | Number | Pos. | Height | Weight | Year | Hometown | Reason for departure | |
|---|---|---|---|---|---|---|---|---|
| Donovan Jackson | 4 | G | 6'2" | 175 | Senior | Graduated | ||
| Jakolby Long | 13 | G | 6'5" | 207 | Sophomore | Transferred to Southern Utah | ||
| 30 | F | 6'9" | 235 | RS Senior | Graduated; signed with Mitteldeutscher BC | |||
| Jeff Beverly | 55 | F | 6'6" | 250 | RS Senior | Graduated |
|-!colspan=12 style=| Regular season|-!colspan=12 style=| Big 12 tournament|-!colspan=12 style=| NCAA tournament
Source:[1]
Marial Shayok (January 7)
Talen Horton-Tucker (November 19)
Tyrese Haliburton (December 10)
Tyrese Haliburton (January 7)
Marial Shayok (January 21)
Lindell Wigginton
See main article: 2018–19 NCAA Division I men's basketball rankings. ^Coaches did not release a Week 1 poll.
*AP does not release post-NCAA tournament rankings.