Hog Island is an island in Narragansett Bay in Rhode Island, USA. It lies at the entrance to the harbor of the town of Bristol, and is part of the town of Portsmouth. The 60-foot (18.3 m) tall Hog Island Shoal Lighthouse stands off the south end, warning ships to beware of the dangerous shoals around the island. The island is home to a small summer vacation colony with no regular year-round residents and has a land area of 0.797 km² (196.97 acres), making it the fifth-largest island in Narragansett Bay.