The 1998 Oklahoma State Cowboys football team represented Oklahoma State University as a member of the Big 12 Conference during the 1998 NCAA Division I-A football season. Led by fourth-year head coach Bob Simmons, the Cowboys compiled an overall record of 5âÂÂ6 with a mark of 3âÂÂ5 in conference play, tying for fourth place in the Big 12's South Division. Oklahoma State played home games at Lewis Field in Stillwater, Oklahoma.