Kamen Rider Faiz (仮面ライダーファイズ, Kamen Raidā Faizu?) is the main protagonist of the 2003-2004 Japanese television series Kamen Rider 555. Its gear is the first of the Rider Gears seen in the series. Its motif is based on the Greek letter phi (Φ).

The Faiz Gear was the second set of Kamen Rider Gear developed by the Smart Brain Corporation to protect the Orphnoch King. The Faiz Gear had less power than the original Delta Gear, but had a much greater functionality. Like most of the Rider Gears that Smart Brain developed, the Faiz Gear can only be worn by Orphnochs or humans implanted with Orphnoch DNA. Transforming into Kamen Rider Faiz burns Orphnoch DNA, so humans who have been implanted with this DNA will quickly run out and no longer be able to use the Faiz Gear. Humans with insufficient DNA are rejected by the Faiz Gear with the word 'error'. Orphnochs may use the Faiz Gear more often (in their human form only), but their DNA breaks down with continued use.

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