Kent is a county in South East England and one of the home counties. It borders Greater London to the northwest, Surrey to the west and East Sussex to the southwest, and Essex to the north across the estuary of the River Thames; it faces the French department of Pas-de-Calais across the Strait of Dover. The county town is Maidstone. It is the fifth most populous county in England, the most populous non-metropolitan county and the most populous of the home counties.

Kent was one of the first British territories to be settled by Germanic tribes, most notably the Jutes, following the withdrawal of the Romans. Canterbury Cathedral in Kent, the oldest cathedral in England, has been the seat of the Archbishops of Canterbury since the conversion of England to Christianity that began in the 6th century with Saint Augustine. Rochester Cathedral in Medway is England's second-oldest cathedral. Located between London and the Strait of Dover, which separates England from mainland Europe, Kent has been the setting for both conflict and diplomacy, including the Battle of Britain in World War II and the Leeds Castle peace talks of 1978 and 2004.

England relied on the county's ports to provide warships through much of its history; the Cinque Ports in the 10th–14th centuries and Chatham Dockyard in the 16th–20th centuries were of particular importance. France can be seen clearly in fine weather from Folkestone and the White Cliffs of Dover. Hills in the form of the North Downs and the Greensand Ridge span the length of the county and in the Vale of Holmesdale in between and to the south are most of the county's 26 castles.

Kent's economy is diversified: agriculture, haulage, logistics and tourism are various industries. Because of its orchards and allotments, Kent is known as "The Garden of England". In northwest Kent, industries include extraction of aggregate building materials, printing and scientific research. Coal mining has also played its part in Kent's industrial heritage. Large parts of Kent are within the London commuter belt and its strong transport connections to the capital and the nearby continent make Kent a high-income county. Twenty-eight per cent of the county forms part of two Areas of Outstanding Natural Beauty: the North Downs and The High Weald.