Brian McMahon

Brian McMahon may refer to:


 * Brian McMahon (rowing) (born 1961), Canadian coxswain
 * Brian McMahon (hurler), former Irish hurler
 * Brian McMahon (footballer) (born 1939), former Australian rules footballer
 * Brian McMahon (New Zealand Army officer) (born c. 1929), New Zealand Army doctor
 * Brian "Barney" McMahon (1928–2010), Irish Air Corps commander 1984–1989