George Hugh Alexander Mackay (20 March 1872 – 5 November 1961) was an Australian politician at state and federal level.

He served in the Queensland Legislative Assembly as a Liberal from 1912 to 1915, before winning the Division of Lilley as a Nationalist at the 1917 federal election.

Mackay joined the new United Australia Party (UAP) in 1931 and served as Speaker of the House of Representatives from 1932 until his retirement in 1934.

He married Edith Ann Heard on 23 September 1896 at the Wesleyan Church in Clermont, after which he joined his sister Barbara in the local bookshop and newsagency.

Shortly afterwards, in 1905, the family moved back to Queensland, settling at Gympie, where Mackay opened an auctioneering and real estate business in partnership with Ray King.