The 2012–13 Top League Challenge Series was the 2012–13 edition of the Top League Challenge Series, a second-tier rugby union competition in Japan, in which teams from regionalised leagues competed for promotion to the Top League for the 2013–14 season.
Coca-Cola West Red Sparks and Kubota Spears won promotion to the 2013–14 Top League, while Mitsubishi Sagamihara DynaBoars and Toyota Industries Shuttles progressed to the promotion play-offs.
The top two teams in Challenge 1 won automatic promotion to the 2013–14 Top League, while the third and fourth-placed teams qualified to the promotion play-offs.
The final standings for the 2012 Top West League were:[1] The final standings for the 2012 Top East League were:[2] The final standings for the 2012 Top Kyūshū League were:[3] The final standings for the 2012–13 Top League Challenge 1 were:[4] The following matches were played in the 2012–13 Top League Challenge 1:[4]
The final standings for the 2012–13 Top League Challenge 2 were:[4] The following matches were played in the 2012–13 Top League Challenge 2:[4]