Samantha Jane McMahon (born 11 December 1967) is a former Australian politician who was a Senator for the Northern Territory between the 2019 federal election and the 2022 federal election. McMahon is a member of the Liberal Democratic Party (LDP), having joined the party in April 2022, several months after resigning from the Country Liberal Party (CLP). While she was a CLP member, she sat in the Nationals party room in federal parliament. She was a veterinarian in Katherine before entering politics.