| 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 |
 Ock, W. (dubbel) | dubbele invoer | |
| 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 |
 Oeffelen, van, Michiel | Michiel van Oeffelen | Zwart-Wit 86 Malden |
 Oegema, Bert | Bert Oegema | Dokkum - Rinsumageest |
 Oegema, Tjalling | Tjalling Oegema (27.05.1946 - 04.07.2021) Add info | |
| Oeij, Tim-Tobi | Tim-Tobi Oeij | |
| Oeij, Yonathan | Yonathan Oeij | |
 Oelen, Bram | Bram Oelen | Witte van Moort Westerhaar |
| Oelen, Tim | Tim Oelen | Witte van Moort Westerhaar |
 Oenen, van, Ouke | Ouke van Oenen | De Waarddammers |
 Oepasie, Bisoenkoemar | Bisoenkoemar Oepasie (16.06.1958 - 25.06.2023) Add info | |
| OERTERP, Ethan | Ethan | |
| OERTERP, Sietse Roel | Sietse Roel | |
| OERTERP-DS19, Broes | Broes | |
| OERTERP-DS19, Senne | Senne | |
| OERTERP-DS19, Siem | Siem | |
| Oestjanov, Stanislav (dubbel) | dubbele invoer | |
| Oetelaar, van den, Lous | Lous van de Oetelaar (04.01.1940 - 26.08.2022) Add info | |
 Oetelaar, van den, Mari | Mari van den Oetelaar | DAmateurs |
| Oetelaar, van den, Maud | Maud van den Oetelaar | |
| Oevelen, van, Ch. | Ch. van Oevelen | |
| Offenberg, Henk | Henk Offenberg | |
 Offenga, Henry | Henry Offenga | Harderwijk |
 Offerman, Rudsel | Rudsel Offerman | Curacao |
| Offinga, Tjitse | Tjitse Offinga | |
| Offinga, Theo | Theo Offinga | |
| Ofman, P. | P. Ofman | |
| Ofwegen, van, Johannes | Johannes van Ofwegen (24.06.1912 - 28.08.1997) Add info | |
| Ogorodnikov, Jurij | Jurij Ogorodnikov | USSR |
 Oh, En-Jie | En-Jie Oh | Taipei |
 Oijen, van, J. | J. van Oijen | Componisten |
 Oink, B | B. Oink | DEZ Oudendijk |
 Ojabstein, Uudo | Uudo Ojabstein | Estonia |
 Okken, Ben | Ben Okken | Damclub Hengelo |
 Okken, Jacob | Jacob Okken | Hijken DTC |
| Okkens, A. | A. Okkens | |
| Okker, Jonas | Jonas Okker (24.10.1862 - 08.09.1925) Add info | |
 Okkerse, Jan | Jan Okkerse | Lent |
| Okoemov, Konstantin | Konstantin Okoemov | Russia |
| Okoneshnikov, Ruslan | Ruslan Okoneshnikov | Russia |
| Okouere, Aivry | Aivry Okouere | Lent |
| Okraszewski, Wojciech | Wojciech Okraszewski | Poland |
| Okrogelnik, Ferdi | Ferdi Okrogelnik | |
| Okrogelnik, Hans | Hans Okrogelnik | |
| Okrogelnik, Rudy | Rudy Okrogelnik | |
 Okrogelnik, Wiel | Wiel Okrogelnik | Damclub Roermond |
| 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 |
 Olde Hanhof, Paul | Paul Olde Hanhof | Nijverdal |
 Olde Hanhof, Theo | Theo Olde Hanhof | TDT Salland |
| Oldekamp, Arjan | Arjan Oldekamp | |
| Oldekamp, Wim | Wim Oldekamp (01.05.1957 - 18.08.2016) Add info | |
 Oldeman, Floris | Floris Oldeman | Heijmans Excelsior Rosmalen |
| Oldenbroek, G. | G. Oldenbroek | |
 Oldenhof , Charlotte | Charlotte Oldenhof | Ons Genoegen Wapenveld |
 Oldenhof, Helms | Helms Oldenhof | Hartholt Olie Heino |
| Oldenhof, John | John Oldenhof | |
| Oldenhuis, Tiemen | Tiemen Oldenhuis (23.02.1937 - 11.11.2020) Info | |
 Oldenkamp, Arjan | Arjan Oldenkamp | Houdt Stand Beilen |
 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 |
| Olij, Johan Christiaan | Johan Christiaan Olij (30.03.1885 - 30.11.1968) Add info | |
| Olij, K. | K. Olij | |
| Olijfveld, Arnold | Arnold Olijfveld | |
 Olimov, Firdavs | Firdavs Olimov | Uzbekistan |
| Olimov, Fitrat | Fitrat Olimov | Uzbekistan |
| Olina, Liva | Liva Olina | Latvia |
| Olink, Johannes Theodorus | Johannes Theodorus Olink | Componisten |
 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 |
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