Charles Watson-Wentworth, 2nd Marquess of Rockingham, was a British Whig statesman and magnate, most notable for his two terms as prime minister of Great Britain. He became the patron of many Whigs, known as the Rockingham Whigs, and served as a leading Whig grandee. He served in only two high offices during his lifetime but was nonetheless very influential during his one and a half years of service.

The Whigs were a political party in the Parliaments of England, Scotland, Ireland, Great Britain and the United Kingdom. Between the 1680s and the 1850s, the Whigs contested power with their rivals, the Tories. The Whigs merged into the Liberal Party with the Peelites and Radicals in the 1850s. Many Whigs left the Liberal Party in 1886 to form the Liberal Unionist Party, which merged into the Conservative Party in 1912.