Straitsmouth Island Lighthouse was built in 1835 to mark the entrance to nearby Rockport Harbor. The relatively small lighthouse is maintained by the U.S. Coast Guard but, the island itself is owned by the Massachusetts Audubon Society as a bird and wildlife sanctuary. The light is easily seen from the tip of Bearskin Neck in downtown Rockport.

Green light flashing every 6 seconds.

Straitsmouth Island Light Station is located on Straitsmouth Island off the coast of Rockport. The island is owned by the Massachusetts Audubon Society and is generally closed to the public. The only access to the island is through occasional MAS kayaking excursions. The U.S. Coast Guard owns and operates the Straitsmouth Island Light Station and it is also closed to the public. Straitsmouth Island Light is visible from the breakwater at the end of Bearskin Neck in Rockport.