The Ōu Honsen (奥羽本戦, Main battle of Ōu, a pun on the Ou Line railroad traversing the prefectures) is a footballing rivalry played between Blaublitz Akita and Montedio Yamagata, both professional J.League teams from the cities in the former Dewa Province, Japan.

[4] Series winners can wear home kits at the opponent's stadium next season.

Statistics as of 21 May 2023 TDK were relegated into the regional league ahead of the 1987 season.

The derby was first contested in 1990 when Tsuruoka club was promoted to Tohoku Soccer League.

Their first league meeting in 28 years resulted in a scoreless draw at Soyu Stadium.