Thorn House, Carpenter Gothic house in San Andreas, Calaveras County, United States

The Thorn House is a Carpenter Gothic house at 87 E. St. Charles Street in San Andreas, built in 1861. Its design features decorative bargeboards, a steeply sloping roof, a porch with a second-floor veranda, and nine French doors opening to the outside. The brick was imported from Stockton, and a landscaped garden covers nearly 3 acres.

The Thorn House was built in 1861 for Ben Thorn, the Calaveras County sheriff known for capturing outlaws such as Black Bart. The brick came from Stockton. Historian Richard Coke Wood called Thorn "one of the greatest men in the history of Calaveras County". The house was listed on the National Register of Historic Places on February 23, 1972.

The house was home to Sheriff Ben Thorn, a prominent figure during California's Gold Rush era, and reflects the community's pride in its past. The architecture with its decorative wooden details and steep roofline shows the craftsmanship and taste of that period.

The house stands at 87 E. St. Charles Street in San Andreas, on a landscaped garden of nearly 3 acres (1.2 ha). It is a private residence, so visitors view the Carpenter Gothic exterior, porch and second-floor veranda from the street. The garden is not open to the public.

The house's bricks were imported from Stockton, roughly 50 miles away, at a time when hauling building material that far over Gold Country roads was a real undertaking. Sheriff Ben Thorn, its builder, was credited by historian Richard Coke Wood as "one of the greatest men in the history of Calaveras County".