Abdication occurs when a monarch, such as a King, Queen, Emperor, or Empress renounces their office.

The word abdication derives from the Latin abdicatio. meaning to disown or renounce (from ab, away from, and dicare, to declare, to proclaim as not belonging to one). In its broadest sense abdication is the act of renouncing and resigning from any formal office, but especially from the supreme office of state. In Roman law the term was also applied to the disowning of a family member, such as the disinheriting of a son. Today the term commonly applies to monarchs, or to those who have been formally crowned. An elected or appointed official is said to resign rather than abdicate.

Among the most memorable abdications of antiquity were those of Lucius Cornelius Sulla the Dictator in 79 BC, Emperor Diocletian in AD 305, and Emperor Romulus Augustulus in AD 476.

Perhaps the most famous abdication in recent memory is that of King Edward VIII of the United Kingdom. In 1936 Edward abdicated the British throne in order to marry American divorcée Wallis Simpson, over the objections of the British establishment, the governments of the Commonwealth, the royal family and the Church of England. The event is known as the abdication crisis. It was the first time in history that the British or English crown was surrendered entirely voluntarily. Richard II of England, for example, was forced to abdicate after power was seized by his cousin, Henry Bolingbroke, while Richard was abroad.

Edward VIII (Edward Albert Christian George Andrew Patrick David; later The Duke of Windsor; 23 June 1894 – 28 May 1972) was King of the United Kingdom and the Dominions of the British Commonwealth, and Emperor of India, from 20 January to 11 December 1936.

Before his accession to the throne, Edward was Prince of Wales and Duke of Cornwall and Rothesay. As a young man, he served in the British Armed Forces during the First World War and undertook several foreign tours on behalf of his father, George V. He was associated with a succession of older, married women but remained unmarried until after his abdication as king.

Edward became king when his father died in early 1936. Only months into his reign, he caused a constitutional crisis by proposing marriage to the American socialite Wallis Simpson, who had divorced her first husband and was seeking a divorce from her second. The prime ministers of the United Kingdom and the Dominions opposed the marriage, arguing that the people would never accept a divorced woman with two living ex-husbands as queen. Additionally, such a marriage would have conflicted with Edward's status as head of the Church of England, which opposed the remarriage of divorced people if their former spouses were still alive. Edward knew that the government led by British Prime Minister Stanley Baldwin would resign if the marriage went ahead, which could have dragged the king into a general election and would ruin his status as a politically neutral constitutional monarch. Rather than end his relationship with Simpson, Edward abdicated. He was succeeded by his younger brother Albert, who chose the regnal name George VI. With a reign of 326 days, Edward was one of the shortest-reigning monarchs in British and Commonwealth history. He was never crowned.