The Porter House Museum is a house and museum in Decorah, Iowa. It was the home of Adelbert Field Porter (1879–1968) and his wife, Grace Young Porter (1880–1964), as well as Grace's mother and father, until their deaths. On August 6, 1975, the house was added to the National Register of Historic Places (as the Ellsworth-Porter House). The house is built in the Italianate style and is located at 401 W. Broadway in Decorah. It is within the Broadway – Phelps Park Historic District, also listed in the National Register of Historic Places.