UFC 231 is an upcoming mixed martial arts event produced by the Ultimate Fighting Championship that will be held on December 08, 2018 at Scotiobank Arena in Toronto, Ontario, Canada.
| Weight Class | Main Card (Fox Sports 1) |
| Featherweight | Max Holloway (c) vs. Brian Ortega |
| Women's Flyweight | Valentina Shevchenko vs Joanna Jedrzejczyk |
| Welterweight | Alex Oliveira vs. Gunnar Nelson |
| Featherweight | Hakeem Dawodu vs. Kyle Bochniak |
| Light Heavyweight | Jimi Manuwa vs. Thiago Santos |
| Weight Class | Preliminary Card (Fox Sports 1) |
| Women's Strawweight | Cláudia Gadelha vs Nina Ansaroff |
| Women's Flyweight | Katlyn Chookagian vs. Jessica Eye |
| Middleweight | Eryk Anders vs. Elias Theodorou |
| Lightweight | Olivier Aubin-Mercier vs. Gilbert Burns |
| Weight Class | Early Preliminary Card (UFC Fight Pass) |
| Light Heavyweight | Devin Clark vs Aleksandar Rakić |
| Bantamweight | Brad Katona vs. Matthew Lopez |
| Welterweight | Chad Laprise vs. Dhiego Lima |
| Lightweight | Carlos Diego Ferreira vs. Jesse Ronson |
