The Vigil of the Princes refers to occasions when members of the British royal family have "stood guard" during the lying in state of one of their relatives during or as part of a British state or ceremonial funeral. This occurred for King George V in 1936, Queen Elizabeth The Queen Mother in 2002, and for Queen Elizabeth II in 2022. During the first two of these occasions, only male members of the British royal family joined the vigil. In 2022 however, Anne, Princess Royal, took part alongside her three brothers in vigils for their mother, Queen Elizabeth II.

Lying in state is the tradition in which the body of a deceased official, such as a head of state, is placed in a state building, either outside or inside a coffin, to allow the public to pay their respects. It traditionally takes place in a major government building of a country, state, or city. While the practice differs among countries, in the United States, a viewing in a location other than a government building, such as a church, may be referred to as lying in repose. It is a more formal and public kind of wake or viewing. Lying in state often precedes a state funeral.