Robert Byron Miller was a lawyer and politician in colonial Tasmania.
Miller was born in London, England, the eldest son of Robert Miller, a barrister, and his wife Jane Matilde, née Montmorini.
Miller was educated at private schools and King"s College, London, and entered as a student at the Middle Temple in April 1843, and was called to the bar in January 1848.
Miller had a younger brother, Maxwell Miller, who also became a Tasmanian politician. Miller decided to emigrate to Tasmania, arriving at Hobart Town in January 1855. He was admitted a barrister in the Supreme Court of Tasmania in August 1855.
Having entered Parliament on 31 May 1861 as member for Launceston, he was Attorney-General in the James Whyte Ministry from January 1863 to November 1866, and was sworn of the Executive Council.
On 3 October 1866 he resigned his Launceston seat and successfully contested the seat of Hobart Town on 26 October 1866. Holding that seat until resigning on 19 August 1867.