Belsize

Belsize could refer to:
 * Belsize Park – also known as 'Belsize' – a neighbourhood in London, the United Kingdom
 * Belsize (ward), a ward named after Belsize Park, London
 * Belsize Lane, a street in Belsize Park
 * Belsize Park Gardens, a street in Belsize Park
 * Belsize House, historic house
 * Belsize Road, a street in South Hampstead, London
 * Belsize, Hertfordshire, a hamlet in Hertfordshire
 * Belsize architects, a firm of architects based in Belsize Park, London
 * Belsize Motors, a former automobile-manufacturing firm based in Manchester