Kensington Palace Gardens is an exclusive street in Kensington, west of central London, near Kensington Gardens and Kensington Palace. Entered through gates at either end and guarded by sentry boxes, it was the location of the London Cage, the British government MI19 centre used during the Second World War and the Cold War. Several foreign diplomatic missions are located along it.
A tree-lined avenue half a mile long studded with embassies, Kensington Palace Gardens is often cited as the "most exclusive address" in London. It is one of the most expensive residential streets in the world, and has long been known as "Millionaires Row", due to the huge wealth of its private residents, although in fact the majority of its current occupants are either national embassies or ambassadorial residences. As of late-2018, current market prices for a property in the street average over £35 million.
It connects Notting Hill Gate with Kensington High Street. The southern section of Kensington Palace Gardens is called Palace Green.