Royal Adelaide was a royal yacht, designed as a miniature sailing frigate, which was built in 1833 and launched in the following year on the orders of King William IV of the United Kingdom, for use on Virginia Water Lake in Windsor Great Park in Surrey, England.

Virginia Water Lake lies on the southern edge of Windsor Great Park, in the borough of Runnymede in Surrey and the civil parishes of Old Windsor and Sunningdale in Berkshire, in England. It is a man-made lake taking its name from a natural body of water of the same name. There is a village of Virginia Water which stretches out to the east of the lake. The grounds of the lake, nearby Fort Belvedere, and the Clockcase are all Grade I listed on the Register of Historic Parks and Gardens.