Sir William Courten or Curteen (1572–1636) was a wealthy 17th century merchant, operating from London. He financed the colonisation of Barbados, but lost his investment and interest in the islands to the Earl of Carlisle.
Sir William Courten was the son of William Courten, by his wife Margaret Casiere, and was born in London in 1572. A younger brother, born in 1581, was named Peter. Their father was son of a tailor of Menin and a protestant. After enduring persecution at the hands of the Spaniards, he escaped to England in 1568; his wife, a daughter Margaret, and her husband Michael Boudean accompanied him. The refugees at first set up a manufactory of French hoods in Abchurch Lane, London, but afterwards removed to Pudding Lane, where they traded in silk and linen. The son-in-law, Boudean, soon died, leaving a son Peter, and the daughter married a second husband, John Money, an English merchant. The father and mother apparently lived till the close of Elizabeth's reign.
At an early age Courten was sent to Haarlem, as factor to his father's firm, and the younger brother, Peter, went to Cologne.
At Haarlem, William married the deaf and dumb daughter of Peter Cromling, a Dutch merchant there, which brought him a dowry of £60,000. About 1600 William returned to London, and Peter remained as his agent in Holland, but paid his brother frequent visits. In 1606 the two brothers entered into partnership with their brother-in-law Money to continue and extend the elder Courten's silk and linen business. William contributed half the capital. In 1619 proceedings were taken in the Star Chamber against Courten, Philip Burlamacchi, and other foreign merchants settled in England, for exporting gold, and a fine of £20,000 was levied on Courten. The firm, Courten & Money, prospered, and it was estimated in 1631 that the capital amounted to £150,000. The prominence of the brothers in the city secured each of them the honour of knighthood. William was knighted 31 May 1622, and Peter 22 February 1622-3.