| Name and firstname(s) | Name Toernooibase | Club or Country |
 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 |
 Oene, van, Sanne | Sanne van Oene | DroomDamsters |
 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) | |
 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 |
