Long Island Head Light is an historic lighthouse on Long Island in Boston, Massachusetts. The current brick tower is the fourth lighthouse on the island. The light was first established in 1819, largely as a result of a study conducted by the Boston Marine Society, which had built the daybeacon on Nixes Mate 14 years earlier. It was a 20-foot (6.1 m) stone tower known as "Inner Harbor Light". It was the second of the four Boston lights—103 years after Boston Light, but ten years before the first daybeacon at the site of Deer Island Light, and before The Graves Light, built in 1905.