| Name and firstname(s) | Name Toernooibase | Club or Country |
 Kapustin, Afanasy | Afanasy Kapustin | Russia |
 Kapustin, Eugenij | Eugenij Kapustin | Belarus |
 Kapustina, Alexandra | Alexandra Kapustina | Ukraine |
| Kapustina, Kateryna | Kateryna Kapustina | Ukraine |
 Kara, Souleymane | Souleymane Kara | Ivory Coast |
 Karadas, Yusuf | Yusuf Karadas | Turkey |
| Karakhan, Ahmed Demir | Ahmed Demir Karakhan | Turkey |
| Karaliou, Mikhail | Mikhail Karaliou | Belarus |
 Karamana, Jean | Jean Karamana | Suriname |
| Karamoko, Soualiho | Soualiho Karamoko | Ivory Coast |
| Karanfil, Selin | Selin Karanfil | Turkey |
| Karankevich, Ksenya | Ksenya Karankevich | Belarus |
 Karansingh, Gena | Gena Karansingh | 020 |
 Karasik, Elena | Elena Karasik | Israel |
 Karask, Ulo | Ulo Karask | Estonia |
| Karataev, Denis | Denis Karataev | Russia |
| Karatosun, Ege | Ege Karatosun | Turkey |
| Kardashevskaia, Alina | Alina Kardashevskaia | Russia |
| Kardashevsky, Evgenyi | Evgenyi Kardashevsky | Russia |
| Kardesseven, Yakup | Yakup Kardesseven | Turkey |
 Kardos, Bernadet | Bernadet Kardos | Hungary |
| Kardymon, Darya | Darya Kardymon | Belarus |
 Kareta, Filip | Filip Kareta | Czech Republic |
 Kargougou, Aziz | Kargougou Aziz | Burkina Faso |
| Karia, Ashokkoemar | Ashokkoemar Karia | Suriname |
| Karijodrono, Cliff | Cliff Karijodrono | Suriname |
| Karimov, Ilfat | Ilfat Karimov | Russia |
| Karimov, Islambek | Islambek Karimov | Russia |
 Karimov, Mukhammadamin | Mukhammadamin Karimov | Uzbekistan |
| Karimova, Dilfuza | Dilfuza Karimova | Uzbekistan |
| Karimova, Guzel | Guzel Karimova | Russia |
 Karimzade, Firdus | Firdus Karimzade | Azerbaidzjan |
 Karklins, Eriks | Eriks Karklins | Latvia |
| Karklins, Lauris | Lauris Karklins | Latvia |
| Karmanova, Valeriya | Valeriya Karmanova | Russia |
| Karmi, Judith | Judith Karmi | Israel |
| Karmi, L. | L. Karmi | Israel |
 Karmi, Lily | Lily Karmi | Canada |
| Karo, Nikalas | Nikalas Karo | Belarus |
 Karoboshev, Orzubek | Orzubek Karoboshev | Kyrgystan |
| Karp, Kenneth | Kenneth Karp | Estonia |
| Karp, Heiki | Heiki Karp | Estonia |
 Karpeles, Richard | Richard Karpeles | France |
 Karpinski, Edward | Edward Karpinski | Poland |
| Karpov, Andrey | Andrey Karpov | Russia |
| Karpova-Sobakina, Ayyyna | Ayyyna Karpova-Sobakina | Russia |
| Karpovich, Palina | Palina Karpovich | Belarus |
| Karpovitsj, Oktavian Stanilavovitsj | Oktavian Stanislavovitsj Karpovitsj | Ukraine |
| Kartodikromo, Virgil | Kartodikromo Virgil | Suriname |
| Kartotaroeno, Robbert | Robbert Kartotaroeno | Suriname |
| Karus, Waldemar | Waldemar Karus | Poland |
 Karvelyte, Urte | Urte Karvelyte | Lithuania |
| Kasanpawiro, K. | K. Kasanpawiro | Suriname |
 Kasca, Bernard | Bernard Kašca (05.05.1958 - 24.03.2019) Add info | |
 Kasca, Kristjan | Kristjan Kašca | Slovenia |
| Kasdiran, Armand | Armand Kasdiran | Suriname |
| Kasendra, Wladyslaw | Wladyslaw Kasendra | Poland |
| Kashapov, Aidar | Aidar Kashapov | Russia |
 Kashif Javed, Muhammad | Muhammad Kashif Javed | Pakistan |
| Kashina, Daria | Daria Kashina | Russia |
| Kashnikau, Aliaksei | Aliaksei Kashnikau | Belarus |
| Kashnikava, Nastassia | Nastassia Kashnikava | Belarus |
| Kasi, Jimmy | Jimmy Kasi | Suriname |
| Kasimovs, T. | T. Kasimovs | Latvia |
| Kask, Adeele | Adeele Kask | Estonia |
| Kask, Karl Jaagup | Karl Jaagup Kask | Estonia |
| Kask, Liina | Liina Kask | Estonia |
| Kask, Margit | Margit Kask | Estonia |
| Kask, Marta | Marta Kask | Estonia |
| Kasperek, Tadeusz | Tadeusz Kasperek | Poland |
| Kasputyte, Margarita | Margarita Kasputyté | Lithuania |
| Kasputyte, Milda | Milda Kasputyté | Lithuania |
| Kassia, NN. | NN. Kassia | France |
 Kassym, Alima | Alima Kassym | Kazachstan |
| Kassym, Karima | Karima Kassym | Kazachstan |
| Kastsiankou, Daniil | Daniil Kastsiankou | Belarus |
| Kasyan, Ekaterina | Ekaterina Kasyan | Ukraine |
| Kasyan, Marina | Marina Kasyan | Ukraine |
 Kasymow, Tulkun | Tulkun Kasymow | USSR |
| Kaszuba, Alicja | Alicja Kaszuba | Poland |
 Katako, katako | Katako Ngoyi | Congo Democratic Republic |
| Kateiva, Saulus | Saulus Kateiva | Lithuania |
| Katerynchyk, Roman | Roman Katerynchyk | Ukraine |
| Katjucha, Aleksandr Jakovlevitsj | Aleksandr Katjucha | Ukraine |
| Katkovskaja, Ilona | Ilona Katkovskaja | Estonia |
| Katlaps, Andris | Andris Katlaps | Latvia |
| Katny, Samuel | Samuel Katny | Poland |
| Katny, Tymoteusz | Tymoteusz Katny | Poland |
| Katorgin, Sergey | Sergey Katorgin | Russia |
 Kats, Bernard | Bernard Kats | Belgium |
| Kats, Leonid | Leonid Kats | USSR |
 Kats, Michael | Michael Kats | USA |
| Kats, Semion | Semion Kats | USSR |
| Katsubinskaya, Anastasiya | Anastasiya Katsubinskaya | Belarus |
 Kaubrys, Justas | Justas Kaubrys | E-Dame |
| Kaulen, Fjodor | Fjodor Kaulen | Russia |
| Kaulena, Dace | Dace Kaulena | Ukraine |
| Kaulya, Alexander | Alexander Kaulya | Ukraine |
 Kaur, Jasleen | Jasleen Kaur | India |
| Kaur, Jasmeet | Jasmeet Kaur | India |
