The Queen's Rangers, also known as the Queen's American Rangers, and later Simcoe's Rangers, were a Loyalist military unit of the American Revolutionary War. Formed in 1776, they were named for Queen Charlotte, consort of George III. The Queen's Rangers was a light corps in the tradition of British rangers during the Seven Years' War, operating on the flanks and in advance of Crown forces, manning outposts, conducting patrols, and carrying out reconnaissance and raiding operations.

Colonists who supported the British cause in the American Revolution were Loyalists, often called Tories, or, occasionally, Royalists or King's Men. George Washington's winning side in the war called themselves "Patriots", and in this article Americans on the revolutionary side are called Patriots. For a detailed analysis of the psychology and social origins of the Loyalists, see Loyalist.