Rina Saigo (born 17 October 2000) is a Japanese tennis player. Saigo has a career-high singles ranking of 418 Women's Tennis Association (WTA), achieved on 21 November 2022. She also has a career-high WTA doubles ranking of 457, set on 7 November 2022. Saigo made her WTA Tour debut at the 2022 Pan Pacific Open after qualifying for the singles main draw.