William Strong (died 1654) was an English clergyman and then pastor of an independent congregation, and member of the Westminster Assembly.
In 1640 he became rector of Moore Critchell in Dorset, but he was driven out in 1643, when the royalists obtained the ascendancy in the county.
On 31 December 1645 the Commons appointed him as successor to Edward Peale in the Westminster Assembly, and on 14 October 1647 he became minister of St. Dunstan's-in-the-West, Fleet Street.. On 9 December 1650 he was chosen pastor to a congregation of independents, which comprised many members of parliament, and to which he preached in Westminster Abbey.
A sermon preached at Westminster in July 1653 'against the liberty of the times as introducing popery,' attracted some attention.
He died in middle life in June 1654, and was buried in Westminster Abbey on 4 July; but on the Restoration his remains, with those of several others, were dug up and thrown into a pit in St. Margaret's churchyard.