The Lord Warden of the Cinque Ports is a ceremonial official in the United Kingdom. The post dates from at least the 12th century, when the title was Keeper of the Coast, but may be older. The Lord Warden was originally in charge of the Cinque Ports, a group of five (cinque in Norman French) port towns on the southeast coast of England that was formed to collectively supply ships for The Crown in the absence at the time of a formal navy. Today the role is a sinecure and an honorary title, and fourteen towns belong to the Cinque Ports confederation. The title is one of the higher honours bestowed by the Sovereign; it has often been held by members of the Royal Family or prime ministers, especially those who have been influential in defending Britain at times of war.

The Lord Warden was solely responsible for the return of all writs to the Crown, along with the collection of taxes and the arrest of criminals. His court was held in St James's church, near Dover Castle, and there he exercised jurisdiction broadly equivalent to that of Chancery. He also had a "lieutenant's powers of muster", and the Constableship of Dover Castle, later added (1267) to the warden's office, enabled him to keep a garrison and administrative staff, including the clerk and the lieutenant of the castle.

The coat of arms of the Cinque Ports first appeared in 1305, second amongst the earliest English known heraldic emblems, predating even the coat of arms of the City of London. The coat of arms of the Cinque Ports displays three ships' hulls and three lions passant guardant conjoined to these hulls, all in gold. These may originally have been Gules three lions passant gardant in pale Or (for England) dimidiating Gules three ships' hulks in pale Or. The coat of arms of the Confederation of the Cinque Ports is set out on a red and blue background and traditionally represents the fourteen "corporate" members.