Duke of Windsor was a title in the Peerage of the United Kingdom. It was created on 8 March 1937 for the former monarch Edward VIII, following his abdication on 11 December 1936. The dukedom takes its name from the town where Windsor Castle, a residence of English monarchs since the time of Henry I, following the Norman Conquest, is situated. Windsor has been the house name of the royal family since 1917.

Edward VIII, later known as the Duke of Windsor, was King of the United Kingdom and the Dominions of the British Empire, and Emperor of India, from 20 January 1936 until his abdication in December of the same year.