Sir Austin Chapman KCMG (10 July 1864 – 12 January 1926) was an Australian politician who served in the House of Representatives from 1901 until his death in 1926.

He was the son of Monica (née Cain; also spelt Kean or Kein) and Richard Chapman, his father being a wheelwright and publican.

[1] In 1901 Chapman was elected to the first House of Representatives as MP for the Division of Eden-Monaro (his brother Albert succeeded him as the member for Braidwood in the New South Wales Parliament).

[7] The success of his efforts benefited many of his friends who owned land in the area, and also greatly boosted trade in Queanbeyan, the nearest town to the site.

He was still MP for Eden-Monaro at the time of his death in Sydney on 12 January 1926 of cerebro-vascular disease, before he could sit in the first Parliament House in Canberra, which opened in May 1927.