Robert McMahon may refer to:
Robert McMahon (footballer) (born 1977), Australian rules footballer Robert J. McMahon (born 1949), American historian Robert H. McMahon, United States Air Force general and government official Bobby McMahon, Scottish football (soccer) analyst in Canada Bob McMahon, lacrosse coach Robert Carrier (chef) (Robert Carrier McMahon, 1923–2006), American chef, restaurateur and cookery writer Robert McMahon, suspect in the Lufthansa heist