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