The James J. Hill House in Saint Paul, Minnesota, United States, was built by railroad magnate James J. Hill. The house, completed in 1891, is near the eastern end of Summit Avenue near the Cathedral of Saint Paul. The house, for its time, was very large and was the "showcase of St. Paul" until James J. Hill's death in 1916. It is listed as a U.S. National Historic Landmark, operated by the Minnesota Historical Society. It is also a contributing property to the Historic Hill District.
The home has 36,000 square feet of living area.