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 Guinness, who arrived at Lyttelton by the ship Tory in August 1852.

[2] He received his legal education from Edward Harston and then from Garrick and Cowlishaw,[3] before being admitted to the bar in 1867.

[6] In his second attempt in 1884, he defeated the incumbent, Joseph Petrie, in the single-member electorate that was by now called Greymouth.

[10] When he died, his replacement from the Grey by-election was Paddy Webb, who was elected on the second ballot with Liberal support.