Rattlesnake Island is a large island in Lake Winnipesaukee, New Hampshire. There are conflicting accounts of where it got its name because its shape looks somewhat like a snake, but some say it is named for a rattlesnake population that lived there.

Rattlesnake Island is about 2 miles long, and approximately 5 miles around its shore. The topography varies greatly. Some sections of the island are quite steep, with the land rising steeply from the shore (affording views of the area), while other sections, particularly on the “peninsula” which protrudes from the southerly side of the island, rise gradually. Rattlesnake Island is the highest (in elevation) island on Lake Winnipesaukee. The top of the so-called “Mount Rattlesnake” (the top of Rattlesnake Island is not officially named) is 874 feet high – rising 370 feet above the mean lake level.

Due to its great height, the island affords extensive views of the lake. There are hiking trails interconnecting with other parts of the island, and these are used frequently by island residents.

At one time, interior lots were to be sold for development. However, this did not occur, and the interior of the island is now set aside as a conservation area. The easterly half (more or less) of the island’s interior is owned by the Lakes Region Conservation Trust, while the westerly portion of the interior is owned by the Rattlesnake Island Association. The Lakes Region Conservation Trust maintains a dock at the far southeastern end of the island, and Conservation Trust members are permitted to dock there and access the hiking trails.

Lake Winnipesaukee is the third-largest lake in New England, covering 69 square miles and having more than 250 islands. The lake was formed by glaciers that reversed its flow from southeast to west. Lake Winnipesaukee is a popular tourist destination, especially in summer, when people enjoy boating, fishing, swimming, and relaxing on its beaches. The lake is surrounded by eight small towns, each with its own charm and attractions. Some of the towns are:

• Alton, the largest town by area in the Lakes Region, where you can hike to Mount Major for stunning views of the lake.
• Gilford, home to Gunstock Mountain Resort, where you can ski in winter and zip-line in summer, and Bank of New Hampshire Pavilion at Meadowbrook, a popular concert venue.
• Laconia, the main commercial city on the lake, where you can visit Weirs Beach, the largest public beach on Winnipesaukee, and play at Funspot Arcade, the world's largest arcade.
• Meredith, a picturesque town with upscale restaurants, wine tasting, and shops. You can also take a cruise on the M/V Sophie C, the oldest floating post office in the United States.
• Wolfeboro, the oldest summer resort in America, where you can explore the downtown area with its historic buildings, museums, and galleries.