Arthur James Diamond (c. 1844 – 22 June 1906) was an Australian businessman and politician who was a member of the Legislative Assembly of Western Australia from 1901 until his death, representing the seat of South Fremantle.
[1] Diamond settled in Adelaide, where he developed broad commercial interests, including the manufacture of jewellery.
[2] In Fremantle, Diamond's business interests focused on his customs and shipping agency, but he also branched out into the wholesale liquor trade.
[3] He initially sat in parliament as an independent, but in 1904 joined the Ministerialist faction, which had future premier Hector Rason as its leader.
[3] However, in April 1906, he suffered a paralytic stroke and cerebral haemorrhage, which led to his death two months later.