Rattlesnake Island is a small island located on Lake Erie in Ohio.

Rattlesnake Island is a private island that was purchased in 1992 for $4.6 million. It is readily accessible only to the 50 members of the Rattlesnake Island Club. The 50 members will never increase, and the list is kept private even from other members. There are only about ten private and exclusive lots on the island. Sale of property on the island is controlled by the island club.

Most of the members just travel to the island to take advantage of the private facilities, including a bar, five-star restaurant, large pool and hot-tub, health club, tennis courts, bocci courts, miniature golf, and much more. Inside the main building, underneath the bar, is a raquetball court, basketball court, pool table, dart board, big-screen television, Pac-Man video game, a pinball machine, card tables, and even a suit of armor. There are two landing strips for airplanes, which come and go often. These grass landing strips double as a small golf course. The pilot's lounge doubles as a pro-shop, with access to score cards and golf balls. Near the runway is a small zoo containing exotic birds and other animals. Members and guests on the island travel from one place to another on electric golf carts. There are also seven hotel rooms which members can stay in for the night. Rattlesnake Island clothing can be purchased from a store located in the same building as the restaurant. In recent years, a second marina was added to the island.

The summer staff, mostly Eastern-European, is around 28, and there are separate dorms for the men and women working there. There is also a year-round caretaker and professional chef. The island's workers are trained to recognize each of the members and their families both by appearance and by the yachts they come in on. Any non-members will immediately be turned away by armed guards in one of the island's two boats before the intruders even have time to dock.

In order to join the Island Club, one of the current members must quit, and the potential member must receive recommendations from at least two of the island's current members. The cost to join is estimated to be between $100,000 and $300,000 initially, as well as a monthly maintenance fee.

The name Rattlesnake comes both from the actual rattlesnakes that used to inhabit the island, as well as from the overall shape of the island (two smaller islands near the tip look like a rattlesnake's rattle). The only wild animals on the island now are pheasants and seagulls.

Rattlesnake Island is the world's most exclusive playground of the wealthy, according to the Discovery Channel.