The 2020–21 Oklahoma State Cowboys basketball team represented Oklahoma State University during the 2020–21 NCAA Division I men's basketball season. The team was led by fourth-year head coach Mike Boynton, and played their home games at Gallagher-Iba Arena in Stillwater, Oklahoma as a member of the Big 12 Conference. They finished the season 21-9, 11-7 in Big 12 Play to finish in 5th place. They defeated West Virginia and Baylor to advance to the championship game of the Big 12 tournament where they lost to Texas. They received an at-large bid to the NCAA tournament where they defeated Liberty in the First Round before getting upset in the Second Round by Oregon State.
Previous season The Cowboys finished the 2019–20 season 18–14, 7–11 in Big 12 play to finish in eighth place. They defeated Iowa State in the first round of the Big 12 tournament before all remaining games were canceled due to the COVID-19 pandemic.
Departures Name Number Pos. Height Weight Year Hometown Reason for departure Jonathan Laurent 1 G/F 6'6" 215 Senior Orlando, FL Graduated Thomas Dziagwa 4 G 6'4" 190 Senior Temple Terrace, FL Graduated Marcus Watson 5 G 6'6" 215 Freshman Buford, GA Transferred to New Mexico State Cameron McGriff 12 F 6'7" 230 Senior Grand Prairie, TX Graduated Yor Anei 14 F 6'10" 235 Sophomore Overland Park, KS Transferred to SMU Lindy Waters III 21 G 6'6" 215 Senior Norman, OK Graduated Trey Reeves 33 F 6'4" 220 Senior Gans, OK Graduated Hidde Roessink 35 F 6'10" 220 Freshman Arnhem, Netherlands Transferred to Kansas City J. K. Hadlock 54 G 6'1" 185 Senior Fairfax, OK Graduated
Incoming transfers Name Number Pos. Height Weight Year Hometown Previous school Bryce Williams 14 G 6'2" 180 Senior Tampa, FL Ole Miss Bernard Kouma 25 F 6'10" 240 Sophomore N'Djamena, Chad South Plains CC Ferron Flavors Jr. 31 G 6'3" 190 Graduate Student Federal Way, WA California Baptist
Recruits
Roster
Schedule and results
!colspan=12 style=|Regular Season
!colspan=9 style=|Big 12 Tournament
!colspan=9 style=|NCAA tournament
References