Atlus is a Japanese video game developer, publisher, arcade manufacturer and distribution company based in Tokyo. A subsidiary of Sega, the company is known for video game series such as Megami Tensei, Persona, Etrian Odyssey, and Trauma Center, as well as Print Club (Purikura) arcade machines. Its corporate mascot is Jack Frost, a snowman-like character from their Shin Megami Tensei series. Outside of video games, the company is known for their Purikura arcade machines, which are selfie photo sticker booths popular in East Asia.

Altus was established in April 1986 and spent its early years as a video game developer for other companies. It became a video game publisher of its own in 1989 and existed until it was merged into Index Corporation in October 2010. After the dissolution, the name Atlus continued as a brand used by Index Corporation for video game publishing until 2013, when it was bought by Sega and revived as a company initially under the name Sega Dream Corporation.