Reiko is a common Japanese feminine personal name, and may refer to:

People

• Reiko Aylesworth (born 1972), American actress
• Reiko Chiba (born 1975), J–pop idol, daughter of the actor Sonny Chiba
• Reiko Douglas, singer and comic, wife of Emmy-winning comedy writer Jack Douglas
• Reiko Ike (born 1953), Japanese actress and singer
• Reiko Kiuchi (born 1968), Japanese seiyū (voice actress)
• Reiko Kudo, Japanese singer with the group Maher Shalal Hash Baz
• Reiko Nakamura (born 1982), Japanese swimmer, bronze medalist in the 2004 Summer Olympics
• Reiko Ohara (born 1946), Japanese actress
• Reiko Okano, (born 1960), Japanese manga artist
• Reiko Okuyama, Japanese animator
• Reiko Omori (born 1984), Japanese seiyū and J-pop idol
• Reiko Oshida (born 1948), Japanese actress and singer
• Reiko Sato (1931 - 1981), American dancer and actress
• Reiko Takagi (born 1973), Japanese seiyū
• Reiko Takashima (born 1964), Japanese actress
• Reiko Tosa (born 1976), Japanese long-distance runner
• Reiko Yamashita (born 1973), J-pop singer, member of the group Oororagoninmusume
• Reiko Yasuhara (born 1969), Japanese singer and seiyū
• Reiko Yoshida, Japanese screenwriter

Fictional characters

• Reiko (Mortal Kombat), a male character from the fighting game series Mortal Kombat
• Reiko Katherine Akimoto, a character in the manga/anime Kochira Katsushika-ku Kameari Kōen-mae Hashutsujo
• Reiko Asakawa, the heroine of the J-Horror film Ring
• Reiko Aya, the human pseudonym of Sailor Aluminum Seiren, one of the Sailor Animamates in the Sailor Moon metaseries
• Reiko Hinomoto, a character in Rumble Roses and Rumble Roses XX
• Rowdy Reiko, Reiko Hinomoto's alter ego
• Reiko Mouryou, the title character in the webcomic Contemplating Reiko
• Reiko Nagase, a virtual race queen from the racing game series Ridge Racer
• Reiko Kurokaki, a fictional character from Marvel Nemesis: Rise of the Imperfects
• Reiko Yuki, a psychic in the animated series Gilgamesh.

Other uses

• Reiko the Zombie Shop, a Japanese manga series by Rei Mikamoto
• Reiko, a novel by New Zealand author Ian Middleton