The Diocesan Boys' School (DBS) is a day and boarding Anglican boys' school in Hong Kong, located at 131 Argyle Street, Mong Kok, Kowloon near Mong Kok East station. Founded in 1869, it is one of the oldest and most prestigious secondary schools in the city. The school's mission is "to provide a liberal education based on Christian principles". Having run as a grant-aided school since it was founded, the school commenced operation in the Direct Subsidy Scheme in September 2003. It uses English as the medium of instruction.