List of post-release content in Splatoon 2

Post-release content is additional content released for Splatoon 2 after the game's release date. Nintendo frequently releases new weapons, stages, modes, features, and gear. Usually, Nintendo announces the release date of upcoming content via their social media accounts. An in-game news announcement introduces the new content when it has been released. Interestingly, most additional content is already in Splatoon 2, waiting to be unlocked by Nintendo. Nintendo has claimed that new content will continue to be released for "about a year".

My Nintendo rewards program
At least four gear items are planned for release through the My Nintendo rewards program after 2018. All of this gear is currently Japan-exclusive, so release through the rewards program could mean worldwide availability.

CoroCoro magazine
CoroCoro magazine held a drawing competition of designing a new piece of gear which the winner design gets to enter the game. It is set to be released at 2019-04-25 for Japanese copies only.

Squid Fashion Contest 2017
In a July 2017 issue, the magazine held the Squid Fashion Contest 2017, which allowed readers to submit gear designs for a chance at having the design added to Splatoon 2. The winning design, a ghillie suit, was added to the game with version. The set includes, , and.

CoroCoro gear
In a November 2017 issue The CoroCoro magazine announced the release of the "Emperor Gear" set, the set worn by "Emperor", the main antagonist of Season 2 of the Splatoon manga. The set includes, , and. In order to obtain it, players must get a unique download code from the December 2017 issue of CoroCoro magazine. The gear was obtainable on 2017-12-15. The download codes only work with the Japanese version of Splatoon 2.

Famitsu offered serial code of gear for purchasing the 4th Splatoon Koshien Fan Book. The book was released at 2019-03-04.