Mia Rosales St. John (born June 24, 1967) is an American professional boxer and former World Boxing Council (WBC) champion in the super welterweight division. She is also the IBA and IFBA lightweight champion. She is also a model, businesswoman, and taekwondo champion.

Early life St. John, a Mexican-American with family roots in Zacatecas, Mexico, was born in San Francisco, California. She attended California State University, Northridge, earning a degree in psychology. While a student, she compiled a taekwondo record of 27–1, was awarded a black belt, and worked as a model to fund her education.

She married actor Kristoff St. John. They had two children, son Julian (1989–2014) and daughter Paris.

Brenda Felter.....................Fight #08
Amanda Skelton...............Fight #10
Linda Robinson.................Fight #18
Amy Yerkes #1...................Fight #19
Amy Yerkes #2...................Fight #21
Linda Tenberg...................Fight #22
Christy Martin #1..............Fight #29
Jessica Mohs #2...............Fight #34
Lana Alexander.................Fight #44
Christy Martin #2..............Fight #60

Lisa Lewis (Last Fight).....Fight #65