The Waddy House, also known as the Williamson farm or the Jarvis Ballard house, is a historic home located at Princess Anne, Somerset County, Maryland, United States.

It is a 1+1⁄2-story, Georgian-style mid-18th-century brick house supported by a raised Flemish bond brick foundation.

The house is one of a small collection of early brick houses surviving in Somerset County.

[2] The Waddy House was listed on the National Register of Historic Places in 1988.

[1] This article about a Registered Historic Place in Somerset County, Maryland is a stub.