The Beppu-Ōita Marathon (別府大分マラソン,Beppu Ōita Marason?) is an annual men's marathon race that takes place every February between the cities of Beppu and Ōita on the island of Kyushu in Japan. The race has IAAF Silver Label Road Race status and is a listed course of AIMS (Association of International Marathons).
First held in 1952 as a 35 km race, the looped marathon course begins at the bottom of Takasaki Mountain and reaches Beppu's Kankoko International Port before turning back towards the finishing point in the Ōita Municipal Athletic Stadium. The event is sponsored by the The Mainichi Newspapers Co. and is formally known as the Beppu-Ōita Mainichi Marathon. It hosted the Asian Marathon Championship in 1994.
The marathon race attracts approximately 500 entrants each year, of whom around two-thirds finish the course. The large majority of the runners are Japanese, or Japanese-based. A small number of international athletes are invited to compete each year, although other foreign athletes also appear in the race for pace setting purposes. An additional road race, the Beppu-Oita Mainichi Half Marathon, was held in conjunction with the main race between 1976 and 2001.
^The International Association of Athletics Federations has published a progression of road racing world bests and records that were widely recognized prior to ratification and official acceptance by the IAAF. According to that progression, Derek Clayton's 2:08:34 performance in Antwerp on May 30, 1969 was a world best at the time. Other road racing authorities, including the Association of Road Racing Statisticians, consider Clayton's performance to have occurred on a short course and recognize other athletes in the progression for world best in the marathon.