Creid (Irish pronunciation: [kɾʲɛdʲ], meaning "Believe") is the arranged soundtrack to Square's role-playing video game Xenogears. It was written by the game's composer Yasunori Mitsuda and performed by a musical ensemble dubbed Millennial Fair. It was released on April 22, 1998 in Japan by DigiCube, and re-released by Square Enix on June 29, 2005. Comprising ten tracks arranged from the Xenogears Original Soundtrack, the album is mostly done in Irish or Celtic music style, with minor influences of Japanese rock according to Mitsuda. Artists from Japan and Ireland were recruited for the project. Four of the five vocal tracks on the album were written by Junko Kudo and sung by Tetsuko Honma, while the title track "Creid" was written by Mitsuda and performed by Eimear Quinn.

The album was well received by critics, who praised both the originality of the concept as well as the execution and track selection. The work on the album inspired Mitsuda to bring Tomohiko Kira, the album's guitarist, back to have him perform in Chrono Cross; this would eventually result in the latter game's ending song "Radical Dreamers ~ Jewel which Cannot be Stolen ~".

Xenogears was Yasunori Mitsuda's first major solo work, as his previous soundtracks were collaborations with other composers with the exception of the score to Radical Dreamers: Nusumenai Hōseki, which never saw an album release. According to Mitsuda, the music of Xenogears belongs to the traditional music genre. Though he first described it as stemming from "a world of [his] own imagining" rather than any specific country, he has also claimed a strong Irish or Celtic music influence. His musical approach for the original soundtrack was to insert Celtic influences into "easy-to-listen-to" pop tracks rather than making either "dense" Celtic music or simple background music. For Creid, he expanded on this theme to create an album of arranged Xenogears music with a more prominent Celtic style. The album contains a mixture of vocal and instrumental tracks, and combines Japanese and Celtic music together in its pieces. The album's title refers to two ideas, with one being "a message to those who feel they have lost sight of their ambitions for the flood of information this era surrounds us with" and the other an affirmation to himself that Mitsuda had "rediscovered [his] own path". Mitsuda felt that with this album, he had "discovered the precise mode of musical expression [he] was seeking within" himself and "given form to the belief within [his] heart".

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