Sir Henry Seymour Baker KCMG, DSO (1 September 1890 – 20 July 1968) was an Australian politician and lawyer.

He served in the Parliament of Tasmania for nearly 40 years, initially as a Nationalist and Liberal in the House of Assembly (1928–1946) where he spent periods as attorney-general (1928–1934) and leader of the opposition (1936–1946).

[1] Baker and his family moved to New Zealand when he was a child, where he attended Palmerston North Boys' High School.

He was initially attached to the Australian General Hospital Convalescent Depot in England, before joining the 4th Field Ambulance and seeing active service in Egypt and on the Western Front.

[2] Baker was awarded the Distinguished Service Order (DSO) for his actions at Le Verguier in September 1918 during the lead-up to the Battle of St Quentin Canal.

Despite a wounded leg, during an advance he captured twenty German prisoners while operating in fog and under machine-gun and artillery fire.

[5] At the 1937 state election, Baker and the Nationalists received endorsements from Hobart's Mercury and Launceston's Examiner, with the latter describing him as "sound, cautious, but presenting a progressive policy".

[8] Baker returned to parliamentary politics in 1948 as an independent member for Queenborough in the nonpartisan Tasmanian Legislative Council.