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
See also
- Brien McMahon (1903–1952), American lawyer and politician
- Bryan McMahon, see Rossington Main Novices' Hurdle
- Brian MacMahon (disambiguation)
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