The City of Westminster is a London borough occupying much of the central area of London, England, including most of the West End. It is located to the west of and adjoining the ancient City of London, directly to the east of the Royal Borough of Kensington and Chelsea, and its southern boundary is the River Thames. It is an Inner London borough and was created in 1965 when Greater London was established. At its creation Westminster was awarded city status, which had been previously held by the smaller Metropolitan Borough of Westminster. Aside from a number of large parks and open spaces, the population density of the district is high. Many sites commonly associated with London are located in the borough, including Buckingham Palace, the Houses of Parliament, and 10 Downing Street. The borough is divided into a number of localities including the ancient political district of Westminster around the Palace of Westminster; the shopping areas around Oxford Street, Regent Street, Piccadilly and Bond Street; and the night time entertainment district of Soho. Much of the borough is residential, and in 2008 it was estimated to have a population of 236,000. The local authority is Westminster City Council.

Die City of Westminster ist ein Londoner Stadtbezirk, der den westlichen Teil des Stadtzentrums bildet. Er liegt westlich der historischen City of London und nördlich der Themse. Westminster besitzt schon seit Jahrhunderten das Stadtrecht und wurde 1965 bei der Gründung von Greater London durch die Stadtbezirke St Marylebone und Paddington der ehemaligen County of London ergänzt.

La Cité de Westminster (City of Westminster) est une circonscription, un arrondissement (borough) de la Région anglaise du grand Londres et une cité à part entière de 222 000 habitants.

City of Westminster är den kanske mest kända av Londons 32 boroughs, beläget väster om City of London. Området används ofta synonymt med West End. Här finns bl. a. regerings- och departementsbyggnaderna i Whitehall, Houses of Parliament (Parlamentshuset), Westminster Abbey, Buckingham Palace, Oxford Street, Piccadilly Circus, Trafalgar Square, Leicester Square, Hyde Park och hotellområdet Bayswater. I Westminster ligger järnvägsstationen Victoria.

City of Westminster - druga obok City najważniejsza dzielnica Centralnego Londynu. W City of Westminster znajduje się, oprócz Buckingham Palace - oficjalnej siedziby królowej, także większość centralnych instytucji rządowo-politycznych (siedziba Parlamentu przy Parliament Square, dzielnica rządowa Whitehall), ambasady, liczne teatry, kina, muzea, sklepy.