McClenahan is a surname. Notable people with the surname include:
Bessie McClenahan (1885–1969), American sociologist and social worker Brian McClenahan (born 1982), American rugby union player Catherine McClenahan (born 1959), Canadian actress, singer, host and writer Charles A. McClenahan (born 1941), American politician Trent McClenahan (born 1985), Australian football (soccer) player
See also McClenahan House, a historic house in Pittsboro, Chatham County, North Carolina, United States McClenaghan, a surname