UFC on Fox 23: Shevchenko vs. Peña was a mixed martial arts event promoted by the Ultimate Fighting Championship held on January 28, 2017 at Pepsi Center in Denver, Colorado. A potential UFC Women's Bantamweight Championship title eliminator between multiple-time muay thai world champion Valentina Shevchenko and The Ultimate Fighter: Team Rousey vs. Team Tate bantamweight winner Julianna Peña served as the event headliner.
Valentina Shevchenko
Julianna Peña
Jorge Masvidal
Donald Cerrone
Francis Ngannou
Andrei Arlovski
Jason Knight
Alex Caceres
Sam Alvey
Nate Marquardt
Raphael Assuncao
Aljamain Sterling
Li Jingliang
Bobby Nash
Jordan Johnson
Henrique da Silva
Eric Spicely
Alessio Di Chirico
Marcos Rogério de Lima
Jeremy Kimball
Alexandre Pantoja
Eric Shelton
Jason Gonzalez
J.C. Cottrell