Nier is a 2010 action role-playing video game developed by Cavia and published by Square Enix for the PlayStation 3 and Xbox 360. In Japan, the game was released as Nier Replicant for the PlayStation 3 with a younger main character, while an alternative version titled Nier Gestalt with an older main character was released for the Xbox 360; Gestalt was released outside of Japan as Nier for both platforms. A remaster of the Japanese version, Nier Replicant ver.1.22474487139... was released worldwide for PlayStation 4, Xbox One, and Windows in 2021.

Square Enix Holdings Co., Ltd. is a Japanese multinational holding company, video game publisher and entertainment conglomerate. It releases role-playing game franchises, such as Final Fantasy, Dragon Quest, and Kingdom Hearts, among numerous others. Outside of video game publishing and development, it is also in the business of merchandise, arcade facilities, and manga publication under its Gangan Comics brand.