Legoland Windsor is a child-oriented theme park and Resort in Windsor, Berkshire in England, themed around the Lego toy system. The park opened in 1996 on the former Windsor Safari Park site as the second Legoland after Legoland Billund in Denmark. The park is located within close distance of Windsor Castle and about 8 miles (13 km) west of London Heathrow Airport. In common with the other Legolands across the world, the park's attractions consist of a mixture of Lego-themed rides, models and building workshops. The park was acquired by Merlin Entertainments in 2005, who now operate the park, with the Lego Group retaining part ownership (30%). The facilities are mainly targeted at children between three and twelve.

In 2011, the park had 1.9 million visitors, making it the joint second most visited theme park in the United Kingdom with Thorpe Park and after Alton Towers, and the joint 10th most visited in Europe, again alongside Thorpe Park.

From 1969 to 1992, the site of today´s Legoland Windsor belonged to Windsor Safari Park, which had been founded by the Billy Smart´s Circus.