John Ferguson Weir (1841–1926) was an American painter, sculptor, writer, and educator. Born in West Point, New York, he was the son of Robert Walter Weir, a professor of drawing at the Military Academy at West Point.
Weir served as the first director of the Yale University School of Fine Arts. His artistic practice encompassed both painting and sculpture, reflecting his diverse professional roles.
His family included other artists; his younger brother, J. Alden Weir, was a painter associated with American Impressionism, and his niece, Irene Weir, was also an artist and educator.