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