| Year: | 1999–2000 |
| Team: | Oklahoma State Cowboys |
| Sport: | Basketball |
| Conference: | Big 12 Conference |
| Short Conf: | Big 12 |
| Coachrank: | 6 |
| Aprank: | 14 |
| Record: | 27–7 |
| Conf Record: | 12–4 |
| Hc Year: | 10th |
| Ac2 Year: | 1st |
| Arena: | Gallagher-Iba Arena (Capacity: 6,381) |
| Tourney Result: | Elite Eight |
The 1999–2000 Oklahoma State Cowboys basketball team represented Oklahoma State University as a member of the Big 12 Conference during the 1999–2000 NCAA Division I men's basketball season. They were led by 10th-year head coach Eddie Sutton and played their home games at Gallagher-Iba Arena in Stillwater, Oklahoma. They finished the season 27–7, 12–4 in Big 12 play to finish in a tie for third place. The Cowboys lost to Iowa State in the semifinals of the Big 12 tournament. The team received an at-large bid to the NCAA tournament as the No. 3 seed in the East region. Oklahoma State reached the Elite Eight after wins over Hofstra, Pepperdine, and Seton Hall, but lost in the regional final to Florida.
Source:[1]
|-!colspan=9 style=| Regular season|-!colspan=9 style=| Big 12 Tournament|-!colspan=9 style=| NCAA Tournament[2]
See main article: 1999–2000 NCAA Division I men's basketball rankings. [3]
See main article: 2000 NBA draft.
[4]