Mitsuya Yoko (三津谷葉子) is a Japanese gravure idol and actress.

Yoko was born in Tokyo but moved to Saitama shortly after she was born. She began practicing ballet as a first grader; her dream was to become a ballerina. When she was in sixth grade, she applied for the Horipro Talent Scout Caravan and was awarded a prize for her excellent work. From there, she made her debut in the photobook Baby Kiss (and was photographed alongside such idols as Yoshii Rei and Omori Reiko). Around this time, future actresses Fukada Kyoko and Sakai Ayana were also making their debuts. (Ayana was also part of the Baby Kiss photobook.)