William Bentinck, 2nd Duke of Portland KG (1 March 1709 – 1 May 1762), styled Viscount Woodstock from 1709 to 1716 and Marquess of Titchfield from 1716 to 1726, was a British peer and politician.

[1] He was an original governor of the Foundling Hospital in London, founded in 1739, and was made a Knight of the Garter in 1741.

[1] Portland is identified in The Handy-Book of Literary Curiosities (1909) as one of the perpetrators of The Great Bottle Hoax of 1749, in which a large crowd was lured to a London theatre with the expectation of seeing a man jump into a "quart bottle".

They had six children: Portland died in May 1762, aged 53, was buried at Westminster Abbey.

He was succeeded in the dukedom by his eldest son William, who became Prime Minister of Great Britain.