Wrestle Kingdom 9 in Tokyo Dome was a professional wrestling pay-per-view event produced by the New Japan Pro-Wrestling (NJPW) promotion, which took place at the Tokyo Dome in Tokyo, Japan on January 4, 2015. It was the 24th January 4 Tokyo Dome Show and the first event on the 2015 NJPW schedule. The event featured ten professional wrestling matches and one pre-show match, six of which were for championships.

New Japan Pro-Wrestling (NJPW) is a Japanese professional wrestling promotion based in Nakano, Tokyo. Founded on January 13, 1972, by Antonio Inoki, the promotion was sold to Yuke's, who later sold it to Bushiroad in 2012. TV Asahi and Amuse, Inc. own minority shares of the company. Naoki Sugabayashi has served as the promotion's Chairman since September 2013, while Hiroshi Tanahashi has served as the president of the promotion since December 2023.