Wrestle Kingdom 12 in Tokyo Dome was a professional wrestling event promoted by New Japan Pro-Wrestling (NJPW). The event took place on January 4, 2018, at the Tokyo Dome in Tokyo, Japan. It was the 27th January 4 Tokyo Dome Show, which is NJPW's biggest annual event and has been called "the largest wrestling show in the world outside of the United States" and the "Japanese equivalent to the Super Bowl".The show was headlined by Kazuchika Okada defending the IWGP Heavyweight Championship against the winner of the 2017 G1 Climax, Tetsuya Naito, in a rematch from Wrestle Kingdom 8 in 2014. The second match of the show's "double main event" saw Kenny Omega defend the IWGP United States Heavyweight Championship against Chris Jericho in a no disqualification match, the latter of whom returned to the NJPW ring after nearly 20 years away from the promotion.

Six other title matches also took place on the show with Hiroshi Tanahashi defending the IWGP Intercontinental Championship against Jay White, Marty Scurll defending the IWGP Junior Heavyweight Championship in a four-way match against Hiromu Takahashi, Kushida and Will Ospreay, Minoru Suzuki defending the NEVER Openweight Championship against Hirooki Goto in a hair vs. hair match, Killer Elite Squad (Davey Boy Smith Jr. and Lance Archer) defending the IWGP Tag Team Championship against the 2017 World Tag League winners Los Ingobernables de Japón (Evil and Sanada), Bullet Club (Bad Luck Fale, Tama Tonga and Tanga Loa) defending the NEVER Openweight 6-Man Tag Team Championship in a five-team gauntlet match and Roppongi 3K (Sho and Yoh) defending the IWGP Junior Heavyweight Tag Team Championship against The Young Bucks (Matt Jackson and Nick Jackson). All in all, the event featured ten matches (including one on the pre-show).