St James's Palace is the most senior royal palace in London, the capital of the United Kingdom. The palace gives its name to the Court of St James's, which is the monarch's royal court, and is located in the City of Westminster in London. Although no longer the principal residence of the monarch, it is the ceremonial meeting place of the Accession Council, the office of the Marshal of the Diplomatic Corps, and the London residence of several members of the royal family.

A royal court, often called simply a court when the royal context is clear, is an extended royal household in a monarchy, including all those who regularly attend on a monarch, or another central figure. Hence, the word court may also be applied to the coterie of a senior member of the nobility. Royal courts may have their seat in a designated place, several specific places, or be a mobile, itinerant court.