| Name and firstname(s) | Name Toernooibase | Club or Country |
 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) | |
 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 |
| Olive, Victorin | Victorin Olive | France |
 Oliveira, Celestino | Celestino Oliveira | Brazil |
| Oliveira, Claudio Gusmao Verdeiro | Claudio Gusmao Verdeiro Oliveira | Brazil |
| Oliveira, de, Jorge Pardo | Jorge Pardo de Oliveira | |
| Oliveira Massola, Lucas | Lucas Oliveira Massola | Brazil |
 Olivia, Glogowski | Olivia Glogowski | Den Haag |
 Olivier, C. | C. Olivier | Switzerland |
| Olivier, Johannes | Johannes Olivier | |
| Olivier, Nic | Nic Olivier | |
| Olivier, Pieter | Piet Olivier (30.09.1914 - 17.09.1989) Add info | |
| Olivier, Willem Frederik | Willem Olivier | Componisten |
| Olivo , Dionicio | Dionicio Olivo | Dominican Republic |
| Oliynyk, Kostiantyn | Kostiantyn Oliynyk | Ukraine |
| Oliynyk, Yevhen | Yevhen Oliynyk | Ukraine |
 Olmedo, Felipe | Felipe Olmedo | Ons Genoegen Utrecht |
| Olsen, A. | A. Olsen | |
| Olsen, Andreas Martinus | Andreas Martinus Olsen (16.02.1878 - 21.12.1959) Add info | |
 Olsen, Arthur | Arthur Olsen | USA |
 Olsman, Esmee | Esmee Olsman | Witte van Moort Westerhaar |
| Olsman, Thomas | Thomas Olsman | Witte van Moort Westerhaar |
 Olst, van, Bas | Bas van Olst | O&O Genemuiden |
| Olst, van, E. | E. van Olst | |
 Olst, van, Jan | Jan van Olst | DEZ-NGKZ Hattem |
| Olst, van, Lorenzo | Lorenzo van Olst | |
| Olst, van, Tiemen | Tiemen van Olst | |
| Olst, van, Wim | Wim van Olst | O&O Genemuiden |
| Olsthoorn, Evert | Evert Olsthoorn | |
 Olsthoorn, Kees | Kees Olsthoorn | Naaldwijk |
| Olszak, Piotr | Piotr Olszak | Poland |
| Olszewska, Malgorzata | Malgorzata Olszewska | Poland |
 Olthof, Freddy | Freddy Olthof | Bornse Damvereniging Borne |
 Olthuis, Evert | Evert Olthuis | Wierden |
| Olthuis, Gerrit Wil | Gerrit Wil Olthuis | Ons Genoegen Wapenveld |
| Olthuis, Karin | Karin Olthuis | Ons Genoegen Wapenveld |
 Oluwatoyin, Akinwola | Akinwola Oluwatoyin | Nigeria |
 Olympus 10 (Erik van Riet Paap), | Olympus 10 (Erik van Riet Paap) | Rapid CCD |
| Olympus 16 (Erik van Riet Paap), | Olympus 16 (Erik van Riet Paap) | Rapid CCD |
 Omarov, Rustem | Rustem Omarov | Kazachstan |
 Omata, Mitsuo | Mitsuo Omata (28.09.1937 - 21.01.2014) Add info | |
 Ombergen-Rentmeester, van, Rianka | Rianka van Ombergen-Rentmeester | PWG s-Gravenpolder |
| Omer, Roni | Roni Omer | |
 Ommen, van, A. | A. van Ommen | Damclub Hoorn |
| Ommen, van, Henk | Henk van Ommen | Ons Genoegen Wapenveld |
| Ommen, van , J. | J. van Ommen | Damclub Hoorn |
