Portrait of the Marquess of Rockingham is a c. 1768 portrait painting of the British politician Charles Watson-Wentworth, 2nd Marquess of Rockingham, who twice served as prime minister.

A wealthy landowner and leader of the Rockingham Whigs, he first became prime minister in 1765 after replacing George Grenville.

[2] A leading society portraitist, in 1769 Reynolds became the first president of the Royal Academy.

His original work is now at St Osyth's Priory, while a full-length replica is in the Royal Collection.

[3] The trimmed-down version is in the collection of the National Portrait Gallery, London, having been presented in 1875.