The 51st Anniversary Show was a professional wrestling event promoted by New Japan Pro Wrestling (NJPW) that took place on March 6, 2023, at the Ota City General Gymnasium in Tokyo, Japan, and was headlined by an IWGP Tag Team Championship match between Bishamon (Hirooki Goto & YOSHI-HASHI) (c) and Hiroshi Tanahashi & Kazuchika Okada. The show also included the second night of the New Japan Cup 2023, featuring two first-round matches.