Guy Carleton, 1st Baron Dorchester, KB (Strabane, Co. Tyrone, Ireland, 3 September 1724 – 10 November 1808 Stubbings, Maidenhead, Berkshire), known between 1776 and 1786 as Sir Guy Carleton, is an Irish-British soldier and administrator.

He twice serves as Governor of the Province of Quebec, from 1768 to 1778, concurrently serving as Governor General of British North America in that time, and from 1785 to 1795.

He commands British troops in the American War of Independence, first leading the defense of Quebec during the 1775 rebel invasion and the 1776 counteroffensive that drives the rebels from the province.

In 1782 and 1783,he leads as the commander-in-chief of all British forces in North America.

In this capacity, he is notable for carrying out the Crown's promise of freedom to slaves who join the British, and he oversees the evacuation of British forces, Loyalists and more than 3,000 freedmen from New York in 1783 to transport them to a British colony.

The military and political career of his younger brother Thomas Carleton is interwoven with his own, and Thomas serves under him in Canada.