Michael John 'Tat' McMahon (28 September 1889 – 6 March 1960) was a rugby union player who represented Australia.

McMahon, a fullback from Rockhampton, claimed 1 international rugby cap for Australia in 1913 as a replacement for Bob Willcocks. He injured his should in 1914, and in 1916 enlisted to join the First Australian Imperial Force as part of the replacements for the 31st Battalion.

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