William Drummond Stewart (Dec. 26, 1795 - Apr. 28, 1871) was a Scottish adventurer and British military officer. He traveled extensively in the American West for nearly seven years in the 1830s. In 1837 he took along the American artist, Alfred Jacob Miller, hiring him to do sketches of the trip. Many of his completed oil paintings of American Indian life and the Rocky Mountains originally hung in Murthly Castle, though they have now been dispersed to a number of private and public collections.