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