Sir Arthur Robert Guinness (11 January 1846 – 10 June 1913) was a New Zealand politician, and Speaker of the House of Representatives.
He was born in Calcutta, India, son of Frank V. Guinness, who arrived at Lyttelton by the ship Tory in August 1852.He was educated at Christ’s College, Christchurch 1854–1859 (being no. 31 on the list). He received his legal education from Edward Harston and then from Garrick and Cowlishaw,before being admitted to the bar in 1867.He then practised as a barrister and solicitor in Greymouth,where he served on the Westland Provincial Council from 1874–1876,and was then a member of the Grey County Council from 1876–1890, including nine as its chair
In 1875, Guinness married Elisabeth Westbrook, daughter of Mr James Westbrook of Launceston. He was knighted in 1911.Guinness died on 10 June 1913 and is buried at Greymouth Cemetery.
He was a great-grandson of his namesake the Dublin brewer Arthur Guinness (1725–1803).