| Operator | Operator (disambiguasi) | Operator (matematika) |
| Operator anti-simetris | Operator bus | Operator identitas |
| Operator jaringan seluler | Operator jaringan virtual seluler | Operator kamera |
| Operator kreasi dan anihilasi | Operator Lapangan | Operator lapangan |
| Operator lift | Operator logika | Operator nonlokal |
| Operator pelabuhan | Operator seluler | Operator tangga |
| Operator telepon | Operator Unary | Operator uner |
| Operet | Operet Bobo | Operet bobo |
| Opereta | Operetta | Operon |
| Operon ara | Operon lac | Opet |
| Opet Alatas | Opet alatas | Opeth |
| Opfenbach | Opfer der Vergangenheit | Opfer der vergangenheit |
| Oph 11 b | Oph 162225-240515 | Ophelia |
| Ophelia (film 2018) | Ophelia (satelit) | Ophelia Settle Egypt |
| Opheltes | Opheltes macrothorax | Ophiacodon |
| Ophidascaris robertsi | Ophidia | Ophidiella |
| Ophidiiformes | Ophidiophobia | Ophiocordyceps unilateralis |
| Ophiocordycipitaceae | Ophiodon | Ophioglossaceae |
| Ophioglossales | Ophioglossum | Ophioglossum pedunculosum |
| Ophioglossum reticulatum | Ophiomorus chernovi | Ophiomorus nuchalis |
| Ophiomorus streeti | Ophion | Ophionomima solocifemur |
| Ophiophagus | Ophiopogon | Ophir Pines-Paz |
| Ophira Eisenberg | Ophiraphidites tortuosus | Ophisops agarwali |
| Ophit | Ophiuchus | Ophiuchus (constellation) |
| Ophiuroidea | Ophlitaspongia kildensis | Ophlitaspongia papilla |
| Ophrynia galeata | Ophrynia infecta | Ophrynia insulana |
| Ophrynia juguma | Ophrynia perspicua | Ophrynia revelatrix |
| Ophrynia rostrata | Ophrynia summicola | Ophrynia superciliosa |
| Ophrynia trituberculata | Ophrynia truncatula | Ophrynia uncata |
| Ophryophorus | Ophryops | Ophryops aegrotus |
| Ophryops dispar | Ophryops fuscicollis | Ophryops medius |
| Ophryops pallidus | Ophryops pseudofuscicollis | Ophtalmibidion |
| Ophtalmibidion auba | Ophtalmibidion luscum | Ophtalmibidion oculatum |
| Ophtalmibidion tetrops | Ophtalmoplon | Ophtalmoplon aurivillii |
| Ophtalmoplon diversum | Ophtalmoplon impunctatum | Ophtalmoplon inerme |
| Ophtalmoplon nigricorne | Ophtalmoplon spinosum | Ophthalmemeopedus |
| Ophthalmemeopedus macrophthalmus | Ophthalmocydrus | Ophthalmocydrus semiorbifer |
| Ophthalmology (jurnal) | Ophuijsen | Ophuijsen (disambiguasi) |
| Opi Bachtiar | Opi bachtiar | Opiaref, biak timur, biak numfor |
| Opiaref, Biak Timur, Biak Numfor | Opiaref, Oridek, Biak Numfor | Opick |
| Opie Kumis | Opie kumis | Opiliaceae |
| Opilio Rossi | Opiliones | Opini |
| Opini (album musik) | Opini (album) | Opini Badan Pemeriksa Keuangan |
| Opini badan pemeriksa keuangan | Opini nasehat mahkamah internasional terhadap deklarasi kemerdekaan kosovo | Opini nasehat Mahkamah Internasional terhadap deklarasi kemerdekaan Kosovo |
| Opini nasihat Mahkamah Internasional perihal deklarasi kemerdekaan Kosovo | Opini nasihat Mahkamah Internasional terhadap deklarasi kemerdekaan Kosovo | Opini publik |
| Opinio juris | Opinio juris sive necessitatis | Opio, Alpes-Maritimes |
| Opior jambul | Opior jawa | Opior Jawa |
| Opior kalimantan | Opior Kalimantan | Opior mata-hitam |
| Opior Mata-hitam | Opior sulawesi | Opis |
| Opisthacanthus | Opisthocoelicaudia | Opisthocomiformes |
| Opisthokonta | Opisthoncana formidabilis | Opisthoncus abnormis |
| Opisthoncus albiventris | Opisthoncus alborufescens | Opisthoncus barbipalpis |
| Opisthoncus bellus | Opisthoncus bitaeniatus | Opisthoncus clarus |
| Opisthoncus confinis | Opisthoncus delectabilis | Opisthoncus devexus |
| Opisthoncus eriognathus | Opisthoncus grassator | Opisthoncus inconspicuus |
| Opisthoncus keyserlingi | Opisthoncus kochi | Opisthoncus lineativentris |
| Opisthoncus machaerodus | Opisthoncus magnidens | Opisthoncus mandibularis |
| Opisthoncus mordax | Opisthoncus necator | Opisthoncus nigrifemur |
| Opisthoncus nigrofemoratus | Opisthoncus pallidulus | Opisthoncus parcedentatus |
| Opisthoncus polyphemus | Opisthoncus quadratarius | Opisthoncus rubriceps |
| Opisthoncus serratofasciatus | Opisthoncus sexmaculatus | Opisthoncus tenuipes |
| Opisthoncus unicolor | Opisthoncus versimilis | Opisthoproctidae |
| Opisthorchiasis | Opisthorchiidae | Opisthorchis viverrini |
| Opisthoteuthidae | Opisthotropis | Opistotonus |
| Opitawak, Tembagapura, Mimika | Opium | Oplah |
| Oplas | Oplatocera | Oplatocera callidioides |
| Oplatocera chujoi | Oplatocera grandis | Oplatocera mandibulata |
| Oplatocera mitonoi | Oplatocera oberthuri | Oplatocera perroti |
| Oplatocera shibatai | Oplatocera siamensis | Opleiding School Voor Inlandsche Ambtenaren |
| Opleiding school voor inlandsche ambtenaren | Oplet | Oplontis |
| Oplosia | Oplosia cinerea | Oplosia nubila |
| Opm | OPM | Opmeer |
| OPML | Opml | Opmu, Mbuwa, Nduga |
| Opname | Opo, Ajangale, Bone | Opo, ajangale, bone |
| Opo, bungku utara, morowali | Opo, Bungku Utara, Morowali | Opo, Bungku Utara, Morowali Utara |
| Opo, bungku utara, morowali utara | Opo-Opo, Krejengan, Probolinggo | Opocapsis declarata |
| Opocapsis dioctrioides | Opoczno | Opol, misamis oriental |
| Opol, Misamis Oriental | Opol, Misamis Timur | Opole |
| Opole Voivodeship | Opolje | OPOP Expo |
| Opor ayam | Opor Ayam | Opor Bakar |
| Opor Bakar Kudus | Opor bakar Kudus | Opor bakar kudus |
| Opor Bakar Sunggingan | Opor bakar sunggingan | Opor bakar Sunggingan |
| Opor kambing | Opor Kambing | Opor Panggang |
| Opor panggang jepara | Opor Panggang Jepara | Opor panggang Jepara |
| Opor Sunggingan | Opor sunggingan | Oporto |
| Oportunisme | Oposisi | Oposisi (astronomi) |
| Oposisi (disambiguasi) | Oposisi (parlementer) | Oposisi (pemerintahan) |
| Oposisi (politik) | Oposisi (semantik) | Oposisi Bersatu |
| Oposisi bersatu | Oposisi Buruh | Oposisi buruh |
| Oposisi Kanan | Oposisi Kiri | Oposisi kiri |
| Oposisi Paling Loyal Sri Baginda (Britania Raya) | Oposisi paling loyal sri baginda (britania raya) | Oposisi parlementer |
| Opossum | Oposum | Oposum air |
| Oposum empat mata Mondolfi | Oposum telinga putih | Oposum tikus ekor gemuk Argentina |
| Oposum tikus Guajira | Oposum tikus Isthmia | Oposum virginia |
| Opoul-Périllos | Opp | Opp, Alabama |
| Opp, alabama | Oppa Thinking | Oppa thinking |
| Oppa, Oppa | Oppa, oppa | Oppède |
| Oppe Pinto | Oppedette | Oppegaard |
| Oppegard | Oppegård | Oppeln |
| Oppenans | Oppenbarbie | Oppenheimer |
