The Loren Andrus Octagon House, also known as Washington Octagon House, is an historic octagonal house located at 57500 Van Dyke Street just north of 26 Mile Road in Washington Township, Macomb County, Michigan. It was built in 1860 by David Stewart for his brother-in-law, Loren Andrus.
The house was used as a "station" on the Underground railway.
It is now owned by the Friends of the Loren Andrus Octagon House, Inc., which bought it in 1987.
On September 3, 1971, it was added to the National Register of Historic Places as the Washington Octagon House.