Christian Brothers' High School, Lewisham (also known as CBHS Lewisham), is a private Roman Catholic comprehensive single-sex secondary 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 approximately 1,350 boys from Year 5 to Year 12. The school is the oldest of the Christian Brothers schools operating in Sydney.