St Barnabas College is a co-educational secondary school in Johannesburg. It is well known as a centre of excellence. The school's mission is to provide quality secondary education to young people, the main criterion for admission being intellectual potential and the motivation to succeed. The school has been identified by the GDE as a focus school of learning in the areas of Mathematics, Science and Technology.

St Barnabas College has always rescued students from socially and economically disadvantaged backgrounds and endeavoured to nurture its students so that they may become accomplished learners and critical thinkers. Programmes in the lower grades are designed to make up for any learning deficits so that students quickly develop basic ability in the use of English and Mathematics. The school offers learning opportunities to prepare students for ultimate success not only at tertiary level, but also in the professions, public service and business. The school is unique in terms of the sources of its students, its result at matriculation level and the success of its students at major universities.