The Balkan Mathematical Olympiad (BMO) is an annual mathematics competition organized by the Mathematical Society of South Eastern Europe (MASSEE). The first BMO was held in Athens, Greece, in 1984, with participation from four countries: Bulgaria, Greece, Romania, and one more. It includes countries from the region as well as guest countries from outside. The competition takes place over one day, with a test consisting of 4 problems to be solved within 4.5 hours.