Rei may refer to any of the following characters:
- Rei Saotome, known as Blair Flannigan in the dub, a character from Yu-Gi-Oh! GX
- Rei Shingetsu, known as Ray Shadows in the dub, real name Vector, a character from Yu-Gi-Oh! ZEXAL
- Rei, known as Reiji Hazama in the Japanese version, a character from the Tag Force games
- Rei, known as No Money Yayoi in the Japanese version, a character from the Tag Force games
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