The William Gray House (also known as the G. H. Simpson House) is a historic house located at 407 Washington Street in La Grange, Lewis County, Missouri.
It was built in about 1860, and is a two-story, three bay wide, side hall plan, brick I-house with Greek Revival style design elements. It has a long one-story brick rear ell and a one-story front porch that surrounds the main entrance.
It was listed on the National Register of Historic Places on June 3, 1999.