The 2019–20 Oklahoma State Cowboys basketball team represented Oklahoma State University in the 2019–20 NCAA Division I men's basketball season.

They were led by third-head coach Mike Boynton Jr.

The Cowboys were members of the Big 12 Conference and played their home games at Gallagher-Iba Arena in Stillwater, Oklahoma.

The Cowboys suffered significant roster attrition and finished the season with only 7 scholarship players, their season ending with first-round loss in the Big 12 men's basketball tournament to TCU.

Graduate transfer Mike Cunningham left the program, and then three players were subsequently dismissed from the team for their connection with in an automobile vandalism incident.