Sean McMahon (born 18 June 1994) is an Australian rugby union player for Suntory Sungoliath in the Japanese Top League.

He played in the side which was runner-up in the 2013 competition and featured alongside future Rebels team-mates Colby Faingaa and Bryce Hegarty.

[1] McMahon's displays saw him named as a member of the Melbourne Rebels extended playing squad for the 2014 Super Rugby season.

[3] He was surprisingly named in the number 6 jersey for the Rebels season opener against the Cheetahs at AAMI Park on 28 February 2014.

[12] On 22 October 2014, McMahon was named in the Australian national team for the Wallabies 2014 End-of-year test, under the new coach of Michael Cheika.