Guy Carleton, 1st Baron Dorchester KB (3 September 1724 – 10 November 1808), known between 1776 and 1786 as Sir Guy Carleton, was an Anglo-Irish soldier and administrator. He twice served as Governor of the Province of Quebec, from 1768 to 1778, concurrently serving as Governor General of British North America in that time, and again from 1785 to 1795. The title Baron Dorchester was created on 21 August 1786. The military and political career of his younger brother, Thomas Carleton, was interwoven with his own, and Thomas served under him in the Canadas.