| Name and firstname(s) | Name Toernooibase | Club or Country |
 Sivuk, Lyudmila | Lyudmila Sivuk | Ukraine |
 Siwek, Martyna | Martyna Siwek | Poland |
| Siwik, Grzegorz | Grzegorz Siwik | Poland |
 Siyi, Lin | Lin Siyi | China |
 Sizov, Andrej | Andrej Sizov | Russia |
| Sjachov, A. | A. Sjachov | Ukraine |
 Sjachsoevarov, K. | K. Sjachsoevarov | USSR |
| Sjakirov, Tachirzjan | Tachirzjan Sjakirov | USSR |
| Sjarafow, K. | K. Sjarafow | USSR |
| Sjarafow, N. | N. Sjarafow | USSR |
| Sjarapow, W. | W. Sjarapow | USSR |
| Sjaverdjan, Boris | Boris Sjaverdjan | USSR |
 Sjende Blyn (Jelle Wiersma), | Sjende Blyn (Jelle Wiersma) | Netherlands |
| Sjestakow, B. | B. Sjestakow | USSR |
| Sjestirikov, Grigory Viktorovitsj | Grigory Viktorovitsj Sjestirikov | Russia |
| Sjisjkin, Aleksandr V. | Aleksandr V. Sjisjkin | USSR |
 Sjkitkin, Boris Vaselijevtisj | Boris Sjkitkin (29.02.1936 - 01.05.2015) Add info | |
 Sjkludov, Petr Aleksandrovitsj | Petr Sjkludov | Belarus |
| Sjmidt, Juri Anatolovitsj | Juri Sjmidt (03.11.1911 - 21.04.1982) Add info | |
| Sjoberg, Georges | Georges Sjöberg ( - 14.11.1949) Add info | |
 Sjoerwamo, Henry | Henry Sjoerwamo | Suriname |
| Sjoetilkin, I. | I. Sjoetilkin | USSR |
| Sjolomentsjev, Nikolai Ivanovitsj | Nikolai Sjolomentsjev | Russia |
| Sjosjin, Aleksandr Ivanovtisj | Aleksandr Sjosjin (03.03.1878 - 19.12.1905) Add info | |
| Sjosjin, Vasili Ivanovitsj | Vasili Sjosjin | |
| Sjpoljanskaja, Tatiana | Tatiana Sjpoljanskaja | USSR |
 Sjtutsjna, E. | E. Sjtutsjna | Foreign players |
| Sjulga, Viktor Ivanovitsj | Viktor Sjulga | Belarus |
| Sjwetsjoek, W. | W. Sjwetsjoek | USSR |
 Sketerskaite, Jore | Jore Sketerskaite | Lithuania |
| Sketerskas, Matas | Matas Sketerskas | Lithuania |
| Skibicki, Jakub | Jakub Skibicki | Poland |
| Skibicki, Mateusz | Mateusz Skibicki | Poland |
| Skliar, Eliazar | Eliazar Skliar | Foreign players |
 Sklyarov, Yevgeniy | Yevgeniy Sklyarov | USA |
| Skobel, Mateusz | Mateusz Skobel | Poland |
| Skolimowska, Malgorzata | Malgorzata Skolimowska | Poland |
| Skonieczna, Grazyna | Grazyna Skonieczna | Poland |
| Skorecki, Lukasz | Lukasz Skorecki | Poland |
| Skorik, Sergei | Sergei Skorik | Russia |
| Skorobogatov, Alexander | Alexander Skorobogatov | Russia |
| Skorohod, Daryna | Daryna Skorohod | Ukraine |
| Skorupinski, Wiktor | Wiktor Skorupinski | Poland |
 Skovitina-Miskova, Elena | Elena Skovitina-Miskova | Moldava, Republic of |
| Skowronek, Daniel | Daniel Skowronek | Poland |
| Skrabov, Vladimir | Vladimir Skrabov | Russia |
 Skramlikova, Helena | Helena Skramlikova | Czech Republic |
| Skriabina, Angelina | Angelina Skriabina | Russia |
| Skriabina, Iuliana | Iuliana Skriabina | Russia |
| Skripnichenko, Ganna | Ganna Skripnichenko | Ukraine |
| Skrobek, Marcel | Marcel Skrobek | Poland |
| Skryabin, Pavel | Pavel Skryabin | Russia |
| Skryabina, Yilana | Yilana Skryabina | Russia |
| Skrzynska, Danuta | Danuta Skrzynska | Poland |
 Skubrijeva, Nikola | Nikola Skubrijeva | Latvia |
| Skutane, Melanija | Melanija Skutane | Latvia |
| Skvortsov, Ivan Vasilijevitsj | Ivan Skvortsov | USSR |
| Skydan, Oleksandra | Oleksandra Skydan | Ukraine |
 Slaby, Antoine | Antoine Slaby (05.01.1928 - 06.02.2017) | Belgium |
| Slaby, Mme | Mme Slaby | Belgium |
 Slama, Asher | Asher Slama | Israel |
| Slambrouck, van, Gert | Gert van Slambrouck | Belgium |
| Slanina, Frantisek | Frantisek Slanina | Czech Republic |
| Slanina, Jaroslav | Jaroslav Slanina | Czech Republic |
| Slapinski, Andrzej | Andrzej Slapinski | Poland |
| Slava, Orest | Orest Slava | Ukraine |
| Slavinskas, Edvardas | Edvardas Slavinskas | Latvia |
| Slavinskas, Z. | Z. Slavinskas | USSR |
| Slavinsks, A. | A. Slavinsks | Latvia |
| Slavova, Nadejda | Nadejda Slavova | Russia |
| Slavska, Oleksandra | Oleksandra Slavska | Ukraine |
| Sleahovscaia, Ana | Ana Sleahovscaia | Moldava, Republic of |
| Sleeuwaert, D. | D. Sleeuwaert | Belgium |
| Slenders, Theo | Theo Slenders | Belgium |
| Slezak, Arkadiusz | Arkadiusz Slezak | Poland |
| Slezak, Mariusz | Mariusz Slezak | Poland |
| Slezak, Zygmunt | Zygmunt Slezak | Poland |
| Slezkin, Pavel Aleksejevitsj | Pavel Slezkin (06.07.1883 - 03.05.1968) Add info | |
| Sliede, Jekabs | Jekabs Sliede | Latvia |
| Slijngard, Achmed | Achmed Slijngard | Suriname |
| Slirina, Alexandra | Alexandra Slirina | Belarus |
| Slobodskoi, Lev | Lev Slobodskoi (23.07.1943 - 24.01.2019) Add info | |
| Sloma, Przemyslaw | Przemyslaw Sloma | Poland |
| Slonim, Shaham | Shaham Slonim | Israel |
| Slowinski, Marian | Marian Slowinski | Czech Republic |
| Sludkoviskih, Boris | Boris Sludkoviskih | Russia |
 Slump, Jitse | Jitse Slump | Witte van Moort Westerhaar |
| Slusarenko, Yuriy | Yuriy Slusarenko | Ukraine |
| Smaidrys, Antanas | Antanas Smaidrys | Lithuania |
| Smaidrys, Sigitas | Sigitas Smadrys | Lithuania |
| Smal, NN. | NN. Smal | Belgium |
| Smaniotto, NN. | NN. Smaniotto | Belgium |
| Smedt, de, Leon | Leon de Smedt | Belgium |
| Smeets, Eddy | Eddy Smeets | Belgium |
| Smeets, Frank | Frank Smeets | Belgium |
| Smeets, Joris | Joris Smeets | Belgium |
| Smeets, Peter | Peter Smeets | Belgium |
| Smeets, Rina | Rina Smeets | Belgium |
| Smertin, Gleb | Gleb Smertin | Russia |
| Smet, de, A. | A. de Smet | Belgium |
