The 2013 Formula Challenge Japan was a multi-event motor racing championship for open-wheel formula racing cars, and the eighth and final season of the Formula Challenge Japan racing series, a young driver development series jointly supported by Honda, Toyota, and Nissan.
The championship featured a mix of manufacturer-affiliated drivers and independent entries, and commenced on 30 March and ended on 10 November.
Yamashita claimed the title after a hat-trick of wins at the final round in Fuji, more than doubling his points tally to emerge victorious in front of Honda-supported Tsubasa Takahashi and fellow Toyota junior Keishi Ishikawa.
Hiroki Shinotani, who had led the championship going into the final round, slipped to fourth in the standings.
The season saw five winners, with Yamashita claiming four, Takahashi winning thrice, Shinotani and Shō Tsuboi claiming two each, and Shōta Kiyohara dominating a single round.