The 2018 All In was the inaugural All In and was an independent professional wrestling pay-per-view (PPV) event promoted by Cody Rhodes and The Young Bucks in association with Ring of Honor (ROH). At the time, Rhodes and the Jacksons had been a part of the Bullet Club of New Japan Pro-Wrestling (NJPW) and ROH. The event took place during Labor Day weekend on Saturday, September 1, 2018, at the Sears Centre Arena in the Chicago suburb of Hoffman Estates, Illinois. The event aired live on traditional PPV outlets, FITE TV, and Honor Club, but it was later made available for on-demand viewing on the NJPW World streaming service. The event included Zero Hour, an hour-long pre-show that aired on WGN America. While independently produced, the event featured wrestlers from NJPW, ROH, Consejo Mundial de Lucha Libre (CMLL), Impact Wrestling, Lucha Libre AAA Worldwide (AAA), Major League Wrestling (MLW), and the National Wrestling Alliance (NWA).

The National Wrestling Alliance (NWA) is an American professional wrestling promotion and governing body owned by Billy Corgan and operated by its parent company Lightning One, Inc.