Constitution Hill is a road in the City of Westminster in London. It connects the western end of The Mall (just in front of Buckingham Palace) with Hyde Park Corner, and is bordered by Buckingham Palace Gardens and Green Park. The term "Hill" is something of a misnomer; there is barely a detectable slope and most observers would regard the road as flat. An old lane on this route was enhanced in connection with the development of Buckingham Palace in the 1820s. It formed an official route from the palace to Hyde Park.