Lime Rock is an island 600 feet offshore in Newport Harbor, in Narragansett Bay, in the U.S. state of Rhode Island. It was made famous by Ida Lewis, who was the lighthouse keeper of the tower built on it in 1854 which is now known as Ida Lewis Rock Light. In 1927 the island was sold to a Yacht Club and was connected to Aquidneck Island by a small causeway.