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Chatham Lighthouse, known as Twin Lights prior to 1923, is a lighthouse in Chatham, Massachusetts, near the "elbow" of Cape Cod. The original station, close to the shore, was built in 1808 with two wooden towers, which were both replaced in 1841. In 1877, two new towers, made of cast iron rings, replaced those.

Location: Chatham, Massachusetts
Coordinates: 41°40′16.704″N 69°57′.554″W
Constructed: 1808
Foundation: Concrete
Construction: Cast iron plate with brick lining
Tower height: 14.5 m (48 ft)
Tower shape: Conical
Markings: White with gray lantern
First lit: 1877 (current structure)
Automated: 1982
Focal height: 80 feet (24 m)
Lens: 4th order Fresnel lens (original), Carlisle & Finch DCB-224 (current)
Range: 24 nautical miles (44 km; 28 mi)
Characteristic: Flash (2) W 10s, lighted continuously
Fog signal: none

I saw this lighthouse on August 18 2021 and on July 12 2022

The tower's original lantern room and Fresnel lens are on display outside the Atwood House Museum

The lighthouse is owned by the Coast Guard. Grounds and tower open during scheduled tours, dwelling closed.

Added to the National Register of Historic Places on June 15 1987

Access: Car