City of London School for Girls, or CLSG for short, is an independent girls' school located in the Barbican complex in the City of London in London, United Kingdom. It is the sister school of the City of London School, an independent boys' school somewhat nearer the river Thames. Intake is from age 7 to 18, though many of its pupils enter at 11, and similarly join other independent schools for the sixth form (17-18).