A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Where WebRef says ‘None’ we have yet to establish a profile for this pioneer, though they are mentioned in wikiPCpedia.com wiki pages.
| WebRef | Surname/link | First name/s | PCpioneers book – page no/s |
| P869 | O’Connor | Kevin | 531 |
| P868 | Oates | Ed | 428 |
| P870 | Odasz | Frank | 388 |
| P1292 | Oded | Itchak | 532 |
| P871 | Odhner | Willgodt Theophil | |
| P872 | Oikarinen | Jarkko | 591 |
| P1324 | Okamoto | Yoshiki | |
| P873 | Olivetti | Adriano | |
| P874 | Oller i Roca | Josep | |
| P875 | Olsen | Ken | 1, 11, 62-5, 74, 262 |
| P876 | Omidyar | Pierre | 552, 553, 554, 555, 561 |
| P877 | Onnes | Heike Kammerlingh | |
| P878 | Opel | John | 286 |
| P879 | O’Regan | Mike | 240 |
| P1368 | Orsenna | Erik | |
| P880 | Osborne | Adam | 18, 124, 178, 419, 611 |
| P881 | Ôshima | Naoto | 205 |
| P882 | Ossanna | Joe F | 56 |
| P883 | Otlet | Paul Marie Ghislain | |
| P884 | Oughtred | William |
