William Douglas (c. 1688 – January 1748), 14th of Cavers was a Scottish politician who sat in the House of Commons between 1715 and 1747.
Douglas was returned at the 1715 British general election, as Member of Parliament (MP) for Roxburghshire on his father's interest.
At the 1722 British general election he moved to Dumfries Burghs and was returned as MP on the Queensberry-Annandale interest.
At the 1727 British general election, he left his seat at Dumfries in favour of his father and returned to Roxburghshire.
In 1742 he resigned as hereditary sheriff in favour of his brother Archibald in order to become Member of Parliament again.