Christian Brothers' High School, Lewisham (also known as CBHS Lewisham), is a Roman Catholic, day school for boys, located in Lewisham, an inner-western suburb of Sydney, New South Wales, Australia. Established in 1891 by the Christian Brothers, the school has a non-selective enrolment policy and currently caters for about 1,350 boys from Years 5 to 12. The school is the oldest of the Christian Brothers schools operating in Sydney.