Thomas McKay (1796–1849) was an Anglo-Métis Canadian Fur trader who worked mainly in the Pacific Northwest for the Pacific Fur Company (PFC), the North West Company (NWC), and the Hudson's Bay Company (HBC). He was a fur brigade leader and explorer of the Columbia District and later became a U.S. citizen and an early settler of Oregon.
Thomas was born at Sault Ste. Marie, Ontario in 1796, or perhaps 1797 or 1798.
His father was the fur trader Alexander MacKay. His mother, from a marriage 'à la façon du pays' (in the style of the country), was a Métis woman named Marguerite Wadin, the daughter of a Cree woman and Jean Etienne Wadin, a Swiss fur trader.
Thomas McKay had at least three wives during his life. His first wife was Timmee T'Ikul Tchinouk a Chinook woman, daughter of Chief Concomly and were married sometime before 1824 in the Oregon Territory. Their children were: Joseph McKay, Margaret McKay, , John T. McKay and Alexander McKay.
McKay's second wife was She-Who-Rides-Like The Wind Umatilla, an Umatilla, they were married about 1834 in the Oregon Territory. Their child was: and was thus William Cameron McKay's (preceding paragraph) half-brother.
At Fort Vancouver on December 31, 1838 he married his third wife, Isabelle Montour, daughter of Nicholas Montour, Jr. and Susanne Humpherville. Their children were: Maria McKay and Thomas McKay.