The Beppu-Ōita Mainichi Marathon (別府大分毎日マラソン, Beppu Ōita Mainichi 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.

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.

[nb 1] Furthermore, Koichi Morishita's win in 1991 was the fastest time recorded that year.

[8] Gert Thys of South Africa won the race in 1996 with a time of 2:08:30 and his mark stood for seventeen years until Yuki Kawauchi completed the course in 2:08:15 in 2013.

[9] The marathon race attracts approximately 500 entrants each year, of whom around two-thirds finish the course.