William Pepperell Montague (11 November 1873 – 1 August 1953) was an American philosopher of the New Realist school.
Montague stressed the difference between his philosophical peers as adherents of either "objective" and "critical realism".
He earned his bachelors, masters, and doctorate from Harvard University.
He was president of the American Philosophical Association's eastern division in the years 1923–1924.
Montague was an advocate of panpsychism and proposed his own variant known as hylopsychism which developed the connection between energy and mind, contending that the physical manifestation of mind occurs as potential energy.