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.

• Zuffa
• Valentina Shevchenko
• Julianna Peña
• Jorge Masvidal
• Donald Cerrone
• Francis Ngannou
• Andrei Arlovski
• Jason Knight
• Alex Caceres