The Osaka-Lake Biwa Marathon (大阪マラソン, Osaka Marathon) is an annual marathon road running event for elite and non-elite men and non-elite women over the classic distance of 42.195 kilometres which is held in late October in the city of Osaka, Japan.

[2] The event is jointly hosted by the Japan Association of Athletics Federations and Yomiuri Shimbun, a Japanese national newspaper.

In total, 27161 runners started the marathon race and of these 26175 finished the full distance.

[4] In 2022, an organisational change by JAAF meant the race was merged into the Lake Biwa Marathon.

[5] The elite men's race is now the Lake Biwa Marathon.