The Junior Balkan Mathematical Olympiad (JBMO) is an annual mathematics competition for students under 15.5 years old, organized by the Mathematical Society of South Eastern Europe (MASSEE). The idea was established in 1994, and the first edition was held in 1997 in Serbia. 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.