From this page you can browse articles translated and published online by English or French title, category of knowledge, or both. You can also browse all of the plates (whether or not the accompanying text has been translated) by English or French title. Also see auxiliary material such as the Map of the System of Human Knowledge.
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- plates by English title
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| Tître | Title |
| OEil des caracteres d'Imprimerie | Typeface |
| Observation [abridged] | Observation [abridged] (Physics. Grammar. Medicine) |
| Observations sur la Division des Sciences du Chancelier Bacon | Observations on Bacon's Division of the Sciences |
| Occulte | Occult |
| Œiel (2) | Type face (2) (Printing) |
| Onglet | Guard (Bookbinder) |
| Opéra | Opera |
| Opéra | Opera (Literature) |
| Opéra comique | Opera, Comic (French theater) |
| Opéra des Bamboches | Opera des Bamboches (French theater) |
| Opéra, Italien | Opera, Italian (Modern theater) |
| Oppresseur | Oppressor (Grammar) |
| Oppression | Oppression (Ethics. Political science) |
| Oppression | Oppression (Medicine) |
| Optimisme | Optimism (Philosophy) |
| Or à dorer les livres | Gold for Gilding Books |
| Orient | Orient |
| Orient | Orient (Commerce) |
| Orient | Orient (Sacred criticism) |
| Orient, empire d' | Eastern Empire (History) |
| Orient, port de l' | Lorient, Port of (Geography) |
| Orion | Orion (Astronomy) |
| Orion | Orion (Mythology) |