Alexander Poynton OBE (8 August 1853 – 9 January 1935) was an Australian politician.
He held ministerial office under Prime Minister Billy Hughes, serving as Treasurer (1916–1917), Minister for Home and Territories (1920–1921), and Postmaster-General (1921–1923).
Poynton was a shearer and union leader before entering politics.
He served in the South Australian House of Assembly (1893–1901) as a supporter of the labour movement before winning election to the House of Representatives at the 1901 federal election.
Following the Australian Labor Party split of 1916 he followed Hughes into the Nationalist Party.