Official UFC Fighter Rankings as of May 24, 2018.
Flyweight (115 – 125 lb / 52.2 — 56.7 kg)
| Demetrious Johnson (Champion) | United States | |
| 1 | Joseph Benavidez | United States |
| 2 | Henry Cejudo | United States |
| 3 | Ray Borg | United States |
| 4 | Jussier da Silva | Brazil |
| 5 | Sergio Pettis | United States |
| 6 | John Moraga | United States |
| 7 | Wilson Reis | Brazil |
| 8 | Alexandre Pantoja | Brazil |
| 9 | Brandon Moreno | Mexico |
| 10 | Dustin Ortiz | United States |
| 11 | Ben Nguyen | United States |
| 12 | Matheus Nicolau | Brazil |
| 13 | Tim Elliott | United States |
| 14 | Deiveson Figueiredo | Brazil |
| 15 | Magomed Bibulatov | Russia |
Bantamweight (125 – 135 lb / 56.7 – 61.2 kg)
| TJ Dillashaw (Champion) | United States | |
| 1 | Cody Garbrandt | United States |
| 2 | Dominick Cruz | United States |
| 3 | Raphael Assuncao | Brazil |
| 4 | Jimmie Rivera | United States |
| 5 | Marlon Moraes | Brazil |
| 6 | John Lineker | Brazil |
| 7 | John Dodson | United States |
| 8 | Aljamain Sterling | United States |
| 9 | Bryan Caraway | United States |
| 10 | Pedro Munhoz | Brazil |
| 11 | Cody Stamann | United States |
| 12 | Rob Font | United States |
| 13 | Thomas Almeida | Brazil |
| 14 | Brett Johns | Wales |
| 15 | Eddie Wineland | United States |
Featherweight (135 – 145 lb / 61.2 – 65.8 kg)
| Max Holloway (Champion) | United States | |
| 1 | Brian Ortega | United States |
| 2 | Jose Aldo | Brazil |
| 3 | Frankie Edgar | United States |
| 4 | Jeremy Stephens | United States |
| 5 | Cub Swanson | United States |
| 6 | Josh Emmett | United States |
| 7 | Ricardo Lamas | United States |
| 8 | Chan Sung Jung | South Korea |
| 9 | Renato Carneiro | Brazil |
| 10 | Darren Elkins | United States |
| 11 | Mirsad Bektic | Bosnia and Herzegovina |
| 12 | Zabit Magomedsharipov | Russia |
| 13 | Myles Jury | United States |
| 14 | Doo Ho Choi | South Korea |
| 15 | Calvin Kattar | United States |
Lightweight (145 – 155 lb / 65.8 – 70.3 kg)
| Khabib Nurmagomedov (Champion) | Russia | |
| 1 | Conor McGregor | Ireland |
| 2 | Tony Ferguson | United States |
| 3 | Eddie Alvarez | United States |
| 4 | Dustin Poirier | United States |
| 5 | Kevin Lee | United States |
| 6 | Edson Barboza | Brazil |
| 7 | Justin Gaethje | United States |
| 8 | Nate Diaz | United States |
| 9 | Michael Chiesa | United States |
| 10 | Al Iaquinta | United States |
| 11 | James Vick | United States |
| 12 | Anthony Pettis | United States |
| 13 | Alexander Hernandez | United States |
| 14 | Paul Felder | United States |
| 15 | Olivier Aubin-Mercier | Canada |
Welterweight (155 – 170 lb / 70.3 – 77.1 kg)
| Tyron Woodley (Champion) | United States | |
| 1 | Stephen Thompson | United States |
| 2 | Rafael dos Anjos | Brazil |
| 3 | Robbie Lawler | United States |
| 3 | Colby Covington | United States |
| 5 | Kamaru Usman | Nigeria |
| 6 | Demian Maia | Brazil |
| 7 | Jorge Masvidal | United States |
| 8 | Darren Till | England |
| 9 | Neil Magny | United States |
| 10 | Santiago Ponzinibbio | Argentina / USA |
| 11 | Donald Cerrone | United States |
| 12 | Gunnar Nelson | Iceland |
| 13 | Alex Oliveira | Brazil |
| 14 | Leon Edwards | Jamaica |
| 15 | Dong Hyun Kim | South Korea |
Middleweight (170 – 185 lb / 77.1 – 83.9 kg)
| Robert Whittaker (Champion) | Australia | |
| 1 | Yoel Romero | Cuba |
| 2 | Luke Rockhold | United States |
| 3 | Chris Weidman | United States |
| 4 | Kelvin Gastelum | United States |
| 5 | Ronaldo Souza | Brazil |
| 6 | Michael Bisping | England |
| 7 | Derek Brunson | United States |
| 8 | David Branch | United States |
| 9 | Lyoto Machida | Brazil |
| 9 | Brad Tavares | United States |
| 11 | Uriah Hall | Jamaica |
| 12 | Antonio Carlos Jr. | Brazil |
| 12 | Thiago Santos | Brazil |
| 13 | Paulo Costa | Brazil |
| 15 | Elias Theodorou | Canada |
Light Heavyweight (185 – 205 lb / 83.9 – 93.0 kg)
| Daniel Cormier (Champion) | United States | |
| 1 | Alexander Gustafsson | Sweden |
| 2 | Volkan Oezdemir | Switzerland |
| 3 | Glover Teixeira | Brazil |
| 4 | Ilir Latifi | Sweden |
| 5 | Jan Blachowicz | Poland |
| 6 | Jimi Manuwa | England |
| 7 | Mauricio Rua | Brazil |
| 7 | Ovince Saint Preux | United States |
| 9 | Corey Anderson | United States |
| 10 | Misha Cirkunov | Latvia / Canada |
| 11 | Patrick Cummins | United States |
| 12 | Dominick Reyes | United States |
| 13 | Gadzhimurad Antigulov | Russia |
| 14 | Tyson Pedro | Australia |
| 15 | Gian Villante | United States |
Heavyweight (205 – 265 lb / 93.0 – 120.2 kg)
| Stipe Miocic (Champion) | United States | |
| 1 | Francis Ngannou | France |
| 2 | Alistair Overeem | Netherlands |
| 3 | Alexander Volkov | Russia |
| 4 | Curtis Blaydes | United States |
| 5 | Derrick Lewis | United States |
| 6 | Mark Hunt | New Zealand |
| 7 | Marcin Tybura | Poland |
| 8 | Andrei Arlovski | Belarus |
| 9 | Alexey Oleynik | Russia |
| 10 | Stefan Struve | Netherlands |
| 11 | Tai Tuivasa | Australia |
| 12 | Shamil Abdurakhimov | Russia |
| 13 | Justin Willis | United States |
| 14 | Junior dos Santos | Brazil |
| 15 | Junior Albini | Brazil |
Women’s Strawweight (under 115 lb / under 52.2 kg)
| Rose Namajunas (Champion) | United States | |
| 1 | Joanna Jedrzejczyk | Poland |
| 2 | Jessica Andrade | Brazil |
| 3 | Claudia Gadelha | Brazil |
| 4 | Karolina Kowalkiewicz | Poland |
| 5 | Tecia Torres | United States |
| 6 | Carla Esparza | United States |
| 7 | Michelle Waterson | United States |
| 8 | Felice Herrig | United States |
| 9 | Tatiana Suarez | United States |
| 10 | Cortney Casey | United States |
| 11 | Alexa Grasso | Mexico |
| 12 | Randa Markos | Canada |
| 13 | Nina Ansaroff | United States |
| 14 | Joanne Calderwood | Scotland |
| 15 | Angela Hill | United States |
Women’s Flyweight (115 – 125 lb / 52.2 — 56.7 kg)
| Nicco Montano (Champion) | United States | |
| 1 | Valentina Shevchenko | Kyrgyzstan / Peru |
| 2 | Sijara Eubanks | United States |
| 3 | Lauren Murphy | United States |
| 4 | Alexis Davis | Canada |
| 5 | Katlyn Chookagian | United States |
| 6 | Barb Honchak | United States |
| 7 | Liz Carmouche | United States |
| 8 | Roxanne Modafferi | United States |
| 9 | Jessica-Rose Clark | Australia |
| 10 | Jessica Eye | United States |
| 11 | Ashlee Evans-Smith | United States |
| 12 | Andrea Lee | United States |
| 13 | Mara Romero Borella | Italy |
| 14 | Paige VanZant | United States |
| 15 | Montana De La Rosa | United States |
Women’s Bantamweight (125 – 135 lb / 56.7 – 61.2 kg)
| Amanda Nunes (Champion) | Brazil | |
| 1 | Holly Holm | United States |
| 2 | Ketlen Vieira | Brazil |
| 3 | Julianna Pena | United States |
| 4 | Raquel Pennington | United States |
| 5 | Germaine de Randamie | Netherlands |
| 6 | Cat Zingano | United States |
| 7 | Marion Reneau | United States |
| 8 | Sara McMann | United States |
| 9 | Aspen Ladd | United States |
| 10 | Bethe Correia | Brazil |
| 11 | Irene Aldana | Mexico |
| 12 | Lucie Pudilova | Czech Republic |
| 13 | Sarah Moras | Canada |
| 14 | Lina Lansberg | Sweden |
| 15 | Gina Mazany | United States |
Pound-For-Pound
| 1 | Demetrious Johnson | Flyweight | United States |
| 2 | Georges St-Pierre | Middleweight | Canada |
| 3 | Stipe Miocic | Heavyweight | United States |
| 3 | Conor McGregor | Lightweight | Ireland |
| 5 | Daniel Cormier | Light heavyweight | United States |
| 6 | Max Holloway | Featherweight | United States |
| 7 | TJ Dillashaw | Bantamweight | United States |
| 8 | Tyron Woodley | Welterweight | United States |
| 9 | Khabib Nurmagomedov | Lightweight | Russia |
| 10 | Cristiane Justino | Women’s Featherweight | Brazil |
| 11 | Tony Ferguson | Lightweight | United States |
| 12 | Amanda Nunes | Women’s Bantamweight | Brazil |
| 13 | Robert Whittaker | Middleweight | Australia |
| 14 | Cody Garbrandt | Bantamweight | United States |
| 15 | Rose Namajunas | Women’s Strawweight | United States |