The Farnsworth Homestead is a historic house museum at 21 Elm Street in Rockland, Maine.

The main block is finished in flushboard siding, while the ells and carriage house are clapboarded.

The main entrance is recessed in the center of the three-bay front facade, framed by pilasters and a corniced entablature.

[2] The house was built in 1854 by William A. Farnsworth, a prominent local businessman involved in the area's lime rock processing industry.

Despite having a large family, most of his properties were eventually inherited by his daughter Lucy, a reclusive spinster who died in 1935.