1964–65 Oklahoma State Cowboys basketball team

The 1964–65 Oklahoma State Cowboys basketball team represented Oklahoma State University as a member of the Big Eight Conference during the 1964–65 NCAA University Division men's basketball season. The team was led by legendary head coach Hank Iba, in his 31st year at the school, and played their home games at Gallagher Hall. The Cowboys finished with a record of 20–7 (12–2 Big Eight) to win the Big Eight title by a three-game margin. They received an automatic bid to the NCAA tournament where they lost to Wichita State in the Midwest regional final.

Oklahoma State won the Big Eight tournament by prevailing over Missouri in double overtime in the championship game. The Cowboys received an automatic bid to the NCAA tournament as No. 5 seed in the West region, making their first appearance in the NCAA Tournament since 1965. The team was upset by No. 12 seed Princeton in the opening round.

Roster
Source:

Schedule and results
!colspan=9 style=| Regular season

!colspan=9 style=| NCAA tournament