The 1999 Oklahoma State Cowboys baseball team represented the Oklahoma State University–Stillwater in the 1999 NCAA Division I baseball season.
The Cowboys played their home games at Allie P. Reynolds Stadium.
The team was coached by Tom Holliday in his 3rd year as head coach at Oklahoma State.
The Cowboys won the Wichita Regional and Waco Super Regional to advance to the College World Series, where they were defeated by the Rice Owls.
Tom Holliday