Concordia College is an independent, co-educational, Lutheran, secondary, day school, located in Highgate, an inner southern suburb of Adelaide, South Australia. Established as a boys school, teachers college and seminary in Murtoa, Victoria in 1890, Concordia moved to its current site in South Australia in 1905, and caters for about 800 students from Years 7 to 12, including about 20 international students. The College operates under the auspices of the South Australian District Synod of the Lutheran Church of Australia, and enrolment priority is given to families who are members of the Church, however students come from a variety of religious backgrounds, Christian denominations, and economic and social circumstances.
The school has been an IB World School since January 2001, and is authorised to offer the IB Middle Years Programme. Concordia is affiliated with the Association of Independent Schools of South Australia (AISSA), the Independent Schools Sport Association (ISSA), the Independent Girls' Schools Sports Association (IGSSA), and the South Australian Secondary Schools Sports Association (SASSSA).