William Owen (c. 1815 – 16 Oct 1869) was a businessman and politician in the young Colony of South Australia. He was a founder of the South Australian Total Abstinence Society.
William Owen and his wife Christina (née Cock) emigrated to South Australia from London in 1838 on the Rajasthan arriving on 16 November 1838. Sometimes referred to as "Captain Owen", he was in business as a produce merchant in Rosina Street then, from 1847, Pirie Street Adelaide. He spent a year in the Swan River Colony, at least partly in the hope that a "change of air" would be beneficial to his wife, who was suffering from tuberculosis. During this time he built up business contacts and exported goods and timber to his Adelaide store, which was being managed by J. J. Warner. In conjunction with A. L. Elder, he chartered the 94 ton brigantine Emma Sherratt for a sugar buying expedition, a consequence of which was a libel suit by Owen against competitor William Younghusband. Owen won the case but was awarded only £20 damages. The Emma Sherratt a half share of which Owen purchased from Sherratt, was the subject of further disputes, and was lost near Samoa in December 1850. Another of Owen's ships, the 140 ton brig Arpenteur, was wrecked in 1849 with a huge loss of cargo, but without loss of life in either case.
He was, from his earliest days in South Australia, a prominent activist in the cause of Total abstinence, a Rechabite and founder of the South Australian Total Abstinence Society, serving as President or Vice-president for many years. He left the colony with his family in 1855 for England and America They returned in February 1858, but Mr. Owen did not resume his old business, but made several trips to the Fiji Islands, following which he made a series of public lectures.
He was elected on a platform of Free Trade and Free Immigration for the seat of City of Adelaide in the South Australian House of Assembly to fill the vacancy left by the resignation of William Henville Burford, and served from May 1859 to March 1860, when he announced his intention not to contest that or any other seat in the next election. He was however nominated for the seat of Port Adelaide, and without any effort or expense on his part was returned at the head of the poll, and served from March 1860 to March 1862, roughly contemporary with fellow abstainer G. W. Cole.