McMahan is a surname. Notable people with the surname include:
Alan McMahan, Christian theologianBrian McMahan, American guitaristChad McMahan, American politician.Jack McMahan (born 1932), American baseball playerJeff McMahan, American philosopherJeff McMahan, American politicianKevin McMahan (born 1983), American football playerMickey McMahan (1930–2008), American trumpeterRonnie McMahan (born 1972), American basketball playerW. Edwin McMahan, American politician