| Name and firstname(s) | Name Toernooibase | Club or Country |
 Oberoi, Tarannum | Tarannum Oberoi | India |
 Oblescak, Ljubo | Ljubo Oblešcak | Slovenia |
 Obornik, Matej | Matej Obornik | Czech Republic |
 Obtsjedkov, S. | S. Obtsjedkov | USSR |
 Obukhova, Diana | Diana Obukhova | Russia |
 Ochirbat, Batmunkh | Batmunkh Ochirbat | Mongolia |
 Ociepa, Barbara | Barbara Ociepa | Poland |
| Odbayar, Ariunjargal | Ariunjargal Odbayar | Mongolia |
| Oderkiewicz, Przemyslaw | Przemyslaw Oderkiewicz | Poland |
 Odia, Emmanuel | Emmanuel Odia | France |
| Odintsjow, Vladimir | Vladimir Odintsjow | USSR |
| Odnoo, Odontuya | Odontuya Odnoo | Mongolia |
 Odor, Jan | Jan Odor | Belgium |
 Odrins, Arturs | Arturs Odrins | Latvia |
 Oduber, Eddy | Eddy Oduber | Aruba |
 Oeditdoebe, Robby | Robby Oeditdoebe | Suriname |
 Oepasie, Bisoenkoemar | Bisoenkoemar Oepasie (16.06.1958 - 25.06.2023) Add info | |
 Offerman, Rudsel | Rudsel Offerman | Curacao |
| Ogorodnikov, Jurij | Jurij Ogorodnikov | USSR |
 Oh, En-Jie | En-Jie Oh | Taipei |
 Ojabstein, Uudo | Uudo Ojabstein | Estonia |
| Okoemov, Konstantin | Konstantin Okoemov | Russia |
| Okoneshnikov, Ruslan | Ruslan Okoneshnikov | Russia |
| Okraszewski, Wojciech | Wojciech Okraszewski | Poland |
| Oksman, Boris | Boris Oksman | Russia |
| Olaerts, Harry | Harry Olaerts | Belgium |
| Olaerts, Maria | Maria Olaerts | Belgium |
| Olaerts, Paula | Paula Olaerts | Belgium |
| Olaerts, Piet | Piet Olaerts | Belgium |
 Olaniyan, Abdul Mandjide Babatunde Razak | Abdul Mandjide Babatunde Razak Olaniyan | Ivory Coast |
 Olechnovicius, A. | A. Olechnovicius | Lithuania |
| Olejnik, Bernard | Bernard Olejnik | Poland |
| Olejnik, Grazyna | Grazyna Olejnik | Poland |
| Olejnik, Jakub | Jakub Olejnik | Poland |
 Olejnik, Sergey | Sergey Olejnik | Ukraine |
| Olekseenko, Valentina | Valentina Olekseenko | Ukraine |
| Oleksienko, Lidia | Lidia Oleksienko | Ukraine |
| Oleksiuk, Ivan | Ivan Oleksiuk | Ukraine |
| Oleksiuk, Natalia | Natalia Oleksiuk | Ukraine |
 Olenburger, Victoria | Victoria Olenburger | Germany |
 Olimov, Firdavs | Firdavs Olimov | Uzbekistan |
| Olimov, Fitrat | Fitrat Olimov | Uzbekistan |
| Olina, Liva | Liva Olina | Latvia |
 Oliphant, Donald | Donald Oliphant | Great-Britain |
 Olius, Georges | Georges Olius | Haiti |
| Olivan, Thomas | Thomas Olivan | France |
 Olivares, Aureliano | Aureliano Olivares | Dominican Republic |
| Olivares, Victor | Victor Olivares | Dominican Republic |
| Olive, Victorin | Victorin Olive | France |
 Oliveira, Celestino | Celestino Oliveira | Brazil |
| Oliveira, Claudio Gusmao Verdeiro | Claudio Gusmao Verdeiro Oliveira | Brazil |
| Oliveira Massola, Lucas | Lucas Oliveira Massola | Brazil |
 Olivier, C. | C. Olivier | Switzerland |
| Olivo , Dionicio | Dionicio Olivo | Dominican Republic |
| Oliynyk, Kostiantyn | Kostiantyn Oliynyk | Ukraine |
| Oliynyk, Yevhen | Yevhen Oliynyk | Ukraine |
 Olsen, Arthur | Arthur Olsen | USA |
| Olszak, Piotr | Piotr Olszak | Poland |
| Olszewska, Malgorzata | Malgorzata Olszewska | Poland |
 Oluwatoyin, Akinwola | Akinwola Oluwatoyin | Nigeria |
 Omarov, Rustem | Rustem Omarov | Kazachstan |
| Omata, Mitsuo | Mitsuo Omata (28.09.1937 - 21.01.2014) Add info | |
| Omolola Jeje, Awotodunbo | Awotodunbo Omolola Jeje | Nigeria |
| Onashko, Artem | Artem Onashko | Ukraine |
| Onikov, Mikhail | Mikhail Onikov | Russia |
| Onishenko, Ruslan | Ruslan Onishenko | Ukraine |
 Onistjenko, A. | A. Onistjenko | Foreign players |
| Ooghe, Marcel | Marcel Ooghe | France |
| Oostburg, Marcel | Marcel Oostburg | Suriname |
| Opanasuk, Oleksiy | Oleksiy Opanasuk | Ukraine |
| Opdekamp, Danny | Danny Opdekamp | Belgium |
| Opdekamp, Marcel | Marcel Opdekamp | Belgium |
| Opdekamp, Stefan | Stefan Opdekamp | Belgium |
| Operman, Dariusz | Dariusz Operman | Poland |
| Opletal, Martin | Martin Opletal | Czech Republic |
| Oplt, Filip | Filip Oplt | Czech Republic |
| Opryshchenko, Maksym | Maksym Opryshchenko | Ukraine |
| Opulskis, Arturas | Arturas Opulskis | Lithuania |
| Orban, Hubert | Hubert Orban | Belgium |
| Ordies, Pierre | Pierre Ordies | Belgium |
 Ordyan, Rafayel | Rafayel Ordyan | Armenia |
| Orechov, V. | V. Orechov | USSR |
| Oreel, Paul | Paul Oreel | Belgium |
| Ori, Krishnapersad | Krishnapershad Ori | Suriname |
 Orie, Devanand | Devanand Orie | CTD Arnhem |
| Orie, Firosh | Firosh Orie | Suriname |
| Orie, William | William Orie | Suriname |
| Orieshkov, Vladimir | Vladimir Orieshkov | Russia |
| Orihovskiy, Ruslan | Ruslan Orihovskiy | Ukraine |
 Orlenis, Bueno | Bueno Orlenis | Cuba |
| Orlova, Alisa | Alisa Orlova | Latvia |
| Orlova, Viivika | Viivika Orlova | Estonia |
| Orlovska, Evelina | Evelina Orlovska | Latvia |
| Orlow, Agata | Agata Orlow | Poland |
| Ornelis, Maurice | Maurice Ornelis | Belgium |
| Orosin, Dulustan | Dulustan Orosin | Russia |
 Orosz, Reka | Reka Orosz | Hungary |
| Ortikkhujayev, O. | O. Ortikkhujayev | Uzbekistan |
| Oryngaliyev, Sagintay | Sagintay Oryngaliyev | Kazachstan |
| Osadchuk, Volodymyr | Volodymyr Osadchuk | Ukraine |
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