alphabetical list:
| Chol-Su O |  | Sang-Sik O | | Satoshi840816 OBARA |  |
| Tadashi960251 OBARA | | Dmitrij OBATUROV |  | Christian OBERBICHLER |  |
| Hans-Peter OBERHUBER |  | Dmitrij OBUSJNOJ |  | Kazunori84C026 OCHI | |
| Sadayoshi79H001 OCHIAI | | Alexander OCHOWICZ |  | Takuro051070 ODA | |
| Tomoki84Iw09 ODA | | Aleksandr ODEGOV |  | Jeroen OEBEN |  |
| Harald OEHME | | Berend OENEMA | | Johan OERLEMANS | |
| Hirobumi84Ao21 OGASAWARA | | Yasuki841146 OGASAWARA | | Yuuta940633 OGASAWARA | |
| Yuuya061246 OGATA | | Arata050914 OGAWA | | Shouya071226 OGAWA | |
| Takuro080854 OGAWA | | Teruyuki000809 OGAWA | | Toshiyuki941202 OGAWA | |
| Konstantin OGIBALOV | | Tatsuya061281 OGINO | | Fumihiko921325 OGIWARA | |
| Noriyuki961028 OGIWARA | | Dmitrij OGLOBLIN | | Yuusuke020570 OGUCHI | |
| Jarosław OGÓREK |  | Han-Seok OH |  | Hong-Jin OH | |
| Seung-Kwan OH | | Young-Seok OH | | Kouji061048 OHAYASHI | |
| Kristian OHR |  | Torstein OHR | | Kazuya001081 OIKAWA | |
| Yuuya930680 OIKAWA | | Daiki050896 OKABE | | Itsuki080902 OKADA | |
| Hiroshi970989 OKAHISA | | Gen010866 OKAMOTO | | Aleksandr OKHOTIN | |
| David OKONIEWSKI | | Kazuhiro942195 OKUAKI | | Chikao84H069 OKUHARA | |
| Tsunaki050825 OKUHARA | | Kazuki030641 OKUMURA | | Tatsuya030730 OKUMURA | |
| Yuuki041010 OKUMURA | | Sergej OKUNEV | | Igor OKUNJOV | |
| Yui991241 OKUNO | | John Arthur OLAFSEN | | Peter OLDENHOF | |
| Remco OLDE HEUVEL | | Wouter OLDE HEUVEL | | Aleksej OLEJNIK | |
| Andrej OLEJNIKOV | | Vladislav OLENIN | | Niels OLIVIER | |
| Ryan OLIVIER | | Samuli OLLANKETO |  | Johnny OLOF | |
| Mattias OLOFSSON |  | Rune OLSEN-FARSTAD | | Martin Stoltz OLSEN | |
| Willy OLSEN | | Craig OLSON |  | Darren OLSON | |
| Kirk OLSON | | Paul OLSON | | Christian OLSSON | |
| Joel OLSÉN | | Joery OLTHUIS | | Björn OLTMER | |
| Thorsten OLTMER | | Alexander OLTROP | | Zei-Son OM | |
| Jegor OMELTSJENKO | | Hitoshi891487 ONDA | | Kouichi89U002 ONO | |
| Shouta021058 ONO | | Suguru970226 ONO | | Yasuyuki001031 ONO | |
| Masaaki75A008 ONODERA | | Kenjiro071229 ONODZUKA | | Kouki840883 OOBA | |
| Masaki871724 OOBA | | Masahito071396 OOBAYASHI | | Takahiro010193 OOE | |
| Ryo980761 OOGAKI | | Hiroyuki960739 OOHASHI | | Tomomi981153 OOHASHI | |
| Akira031041 OOI | | Takenori890875 OOI | | Mark OOIJEVAAR | |
| Akihiko980966 OOISHI | | Takuya960177 OOISHI | | Ryuutaro010191 OOIZUMI | |
| Satoshi920300 OOKE | | Kazumitsu991385 OOKUBO | | Naokazu021110 OOKURA | |
| Ryuuichi011089 OOMICHI | | Hiroshi991138 OOMIYA | | Fuyuki010550 OOMORI | |
| Masahiko941936 OOMURA | | Ichiro001165 OONISHI | | Tomonori911896 OONISHI | |
| Yuusuke960111 OONISHI | | Eiji960666 OONUKI | | Takashi911387 OOSATO | |
| Kenta941276 OOSAWA | | Jorrit OOSTEN | | Roderick OOSTEN | |
| Gert-Jan OOSTERBOS | | Dirk OOSTERINK | | Fred OOSTERLAAN | |
| Akio971057 OOTA | | Masahito84U067 OOTA | | Hitoshi010569 OOTANAKA | |
| Daisuke010310 OOTOUGE | | Seitaro960507 OOTOUGE | | Takanori991415 OOTSU | |
| Tatsuki030243 OOTSUKA | | Takahiro051269 OOTSUKI | | Yuuta071419 OOTSUKI | |
| Takuma030715 OOUCHI | | Tomonori910573 OOUCHI | | Kouji001176 OOWADA | |
| Makoto041015 OOWADA | | Tsukasa021141 OOWADA | | Artur OPALIŃSKI | |
| Ion OPINCARIU |  | Alexandru Vlad OPREA | | Sebastiaan ORANJE | |
| Jeroen OREMUS | | Aleksandr ORESJKIN | | Jacques ORIE | |
| Norio84H147 ORIKAWA | | John ORLIKOW | | Kelly ORLOFF | |
| Boris ORLOV | | Jurij ORLOV | | Mikhail ORLOV | |
| Oleg ORLOV | | Sergej ORLOV | | Vladimir ORLOV | |
| Khyl ORSER | | Liam ORTEGA | | Manabu941401 OSADA | |
| Tsubasa980298 OSADA | | Nikita OSADTSJIJ | | Shintaro010931 OSANAI | |
| Toshiyuki921733 OSANO | | Kou081160 OSAWA | | Takahiro071208 OSHIMA | |
| Rasjid OSIN | | Wierd OSINGA | | Aart OSKAM | |
| Hidetoshi010087 OSODA | | Aleksandr OSTROVSKIJ | | Vjatsjeslav OSTROVSKIJ | |
| Gabriel OTHENIN-GIRARD | | Steffen Floor OTNES | | Yoshimi860213 OTSUKI | |
| Arjan OTTENS | | Hein OTTERSPEER | | Muncef OUARDI | |
| Ton OUDSHOORN | | John OUDT | | Steven OUTEN |  |
| Aleksandr OVDIN | | Ad OVERDEVEST | | Arjan OVERDEVEST | |
| Thomas OVEREND | | Rickardo OVERHEUL | | Kevin OVERLAND | |
| Jelle OVERMARS | | Pieter OVERMARS | | Sergej OVSJANNIKOV | |
| Aleksandr OVTSJARENKO | | Aleksandr OVTSJINNIKOV | | Maksim OVTSJINNIKOV | |
| Christian OWESEN | | Tom Erik OXHOLM | | Mikio69A001 OYAMA | |
| Shousuke840939 OYAMA | | Haruki921290 OZAWA | | Ryuichi912198 OZAWA | |
| Igor OZEROV | |
