The 1849 Terwilliger House is a Registered Historic Place in the McHenry County, Illinois, village of Bull Valley.

The Greek Revival house is topped with a square cupola and surrounded by a columned porch.

[2] Samuel Terwilliger was the third settler of Nunda Township in McHenry County, Illinois, after George Stickney and Benjamin McOmber.

The house is built on a foundation of fieldstone and locally produced soft red brick.

The Greek Revival porch dominates the southern, eastern, and northern facades with large Doric columns.