Athletes A–Z
30 athletes| Full Name | Nickname | Division | Nationality | Notable Titles |
|---|---|---|---|---|
| Oana Amalia Marinescu | — | — | — | — |
| Oana Maria Purcaru | — | — | — | — |
| Obenrocksman Arrah | — | Men's Open | United Arab Emirates | — |
| Odalys Ferreira | — | Women's Figure | — | — |
| Okeksandr Slobodyanyuk | — | Men's 212 | — | — |
| Oksana Grishina | — | Women's Fitness | Russia | — |
| Oleg Zhur | — | Men's Open | Ukraine | — |
| Oleh Kryvyi | — | Men's 212 | Ukraine | — |
| Oleh Kryvyl | — | — | — | — |
| Olena Mykhailiuk | — | Women's Figure | — | — |
| Olesya Kochura | — | Women's Figure | Ukraine | — |
| Olga Puzanova | — | Ms. Olympia | — | — |
| Olga Viazmetinova | — | Bikini | — | — |
| Oliver Adzievski | — | — | — | — |
| Oliver Prochazka | — | Classic Physique | — | — |
| Omar Bautista | — | Men's Physique | — | — |
| Omar Boresli | — | Men's Physique | — | — |
| Omar Suleiman | — | Men's Physique | — | — |
| Omer Bahamed | — | Men's Physique | — | — |
| Ommie Ali | — | Men's Physique | — | — |
| Ommie Ryan | — | Men's Physique | United Kingdom | — |
| Ondrej Kmostak | — | Men's Physique | Czech Republic | — |
| Ornella Angileri | — | — | — | — |
| Orsolya Trucza | — | — | — | — |
| Orville Burke | — | Men's Open | United States | — |
| Oscar Gonzalez Gil | — | Men's Wheelchair | — | — |
| Oscar Sanchez | — | Men's 212 | — | — |
| Osmar Alanis | — | Classic Physique | Mexico | — |
| Ottavia Mazza | — | Bikini | Italy | — |
| Ozcan Kirant | — | Men's Physique | — | — |