Windsor (usually pronunced 'winzer', but the d may be included) is a small town in Berkshire on the south-western outskirts of London. It is the location of Windsor Castle, one of the official residences of the British royal family. The castle was originally established by King William I of England but has been substantially altered and added to over the centuries.

It is also the location of Legoland.

The town is administered by the Windsor and Maidenhead unitary authority.