City of London Sinfonia (CLS) is an English chamber orchestra based in London. CLS performs regularly across the city of London in venues from East London clubs to traditional Central London concert halls. CLS is orchestra-in-residence at Opera Holland Park since 2004 and holds a residency at St Paul's Cathedral. The orchestra has developed close links with joint venture partners in Mexico and Japan, having toured to Mexico in May 2015 and to Japan in March 2017. It is a registered charity under English law.