Thomas Wharton, 1st Marquess of Wharton PC (August 1648 – 12 April 1715) was an English nobleman and politician. A man of great charm and political ability, he was also notorious for his debauched lifestyle.
He was the son of Philip Wharton, 4th Baron Wharton and his second wife, Jane Goodwin, only daughter of Colonel Arthur Goodwin of Upper Winchendon, Buckinghamshire, and heiress to the extensive Goodwin estates in Buckinghamshire, including Winchendon, Wooburn, Waddeston, Weston, and other properties.
In his long political career he was a Member of Parliament for seventeen years and spearheaded the Whig opposition to King James II's government, which later developed the two party political system under Queen Anne. Before the Glorious Revolution he was in close contact with a group of army officers conspiring against King James, including his brother Captain Henry Wharton.
In 1689 he was sworn of the Privy Council and made Comptroller of the Household by King William III, establishing the link between the royal position and government for the first time, although William is said to have distrusted him.
He went out of office in 1702, after the accession of Anne (who disliked him intensely, and took great pleasure in personally taking his staff of office from him), but in 1706, he was created Earl of Wharton and Viscount Winchendon in the Peerage of England. He served as Lord Lieutenant of Ireland 1708–1710.