The Senator Walter Lowrie Shaw House is an historic home located in downtown Butler, Butler County, Pennsylvania, United States.

Considered the last of its kind in the city of Butler, it is known in the area for being the home of Butler's only United States Senator, Walter Lowrie.

Situated behind the Butler County Courthouse, it houses the Butler County Historical Society's office, and is maintained as a museum by the Society.

It is a two-and-one-half-story, brick dwelling on a cut stone foundation, and has a slate covered gable roof.

It was listed on the National Register of Historic Places in 1979.