The 2015 Oklahoma State Cowboys football team represented Oklahoma State University in the 2015 NCAA Division I FBS football season. The Cowboys were led by 11th-year head coach Mike Gundy and played their home games at Boone Pickens Stadium in Stillwater, Oklahoma. They were members of the Big 12 Conference. They finished the season 10–3, 7–2 in Big 12 play to finish in a tie for second place. They were invited to the Sugar Bowl where they lost to Ole Miss.