The Macedonian-Adrianopolitan Volunteer Corps (, Makedono-odrinsko opalchenie) was a volunteer corps of the Bulgarian Army during the Balkan Wars. It was formed on 23 September 1912 and consisted of Bulgarian volunteers from Macedonia and Thrace, regions still under Ottoman rule, and thus not subject to Bulgarian military service. Opalchenie Peak in Vinson Massif, Antarctica is named after the Bulgarian Volunteer Force in the 1877-1878 Russo-Turkish War and the Macedonian-Adrianople Volunteer Force in the 1912-1913 Balkan Wars.