| Oppaker | Oppakermoen | Oppam |
| Oppam (soundtrack) | Oppam Oppathinoppam | Oppama |
| Oppama (disambiguation) | Oppama base | Oppama Park |
| Oppama Station | Oppama Testing Facility | Oppan Gangnam Seutail |
| Oppan Gangnam seutail | Oppan Gangnam style | Oppan Gangnam Style |
| Oppan gangnam style | Oppana | Oppanakara Street |
| Oppanda | Oppanda (2022 film) | Oppari |
| Oppas | Oppau | Oppau (disambiguation) |
| Oppau disaster | Oppau explosion | Oppavia |
| Oppåkermoen | Oppåt med gröna hissen | Oppède |
| Oppède-le-Vieux | Oppé | Oppé, Paul |
| Oppé, Tom | Oppéde-le-Vieux | OPPC |
| OppCharge | OPPD | Oppdageren |
| Oppdal | Oppdal (village) | Oppdal Airport |
| Oppdal Airport, Fagerhaug | Oppdal Church | Oppdal Municipality |
| Oppdal Station | Oppe | Oppe Pinto |
| Oppe Quiñónez | Oppe Quiñones | Oppe Quiñonez |
| Oppe Quinones | Oppe-yoh | Oppe-yoh, California |
| Oppeano | Oppedal | Oppede |
| Oppede-le-Vieux | Oppedette | Oppedisano |
| Oppegaard Spur | Oppegaard, David | Oppegach |
| Oppegach, California | Oppegard | Oppegard Station |
| Oppegard, Peter | Oppegård | Oppegård Chapel |
| Oppegård Municipality | Oppegård Station | Oppegoeh |
| Oppegoeh, California | Oppeid | Oppel |
| Oppel illusion | Oppel, Richard | Oppel-Kundt illusion |
| Oppelia | Oppeliidae | Oppeliinae |
| Oppeln | Oppeln (disambiguation) | Oppeln (region) |
| Oppeln-Bronikowski | Oppelni László | Oppelo |
| Oppelo, AR | Oppelo, Arkansas | Oppelt |
| Oppelwitz | Oppen | Oppen, George |
| Oppen, Mary | Oppenans | Oppenau |
| Oppenauer oxidation | Oppenauer Oxidation | Oppenauer-Woodward oxidation |
| Oppenauer–Woodward oxidation | Oppenbarbie | Oppenberg |
| Oppenberg (Steiermark) | Oppenh. | Oppenheim |
| Oppenheim (disambiguation) | Oppenheim (surname) | Oppenheim + Zebrak |
| Oppenheim and St. Johnsville Union Society Church | Oppenheim Architecture | Oppenheim Architecture + Design |
| Oppenheim Collins | Oppenheim Collins & Company, Inc | Oppenheim Collins & Company, Inc. |
| Oppenheim conjecture | Oppenheim family | Oppenheim Family |
| Oppenheim Toy Award | Oppenheim Toy Portfolio Award | Oppenheim's conjecture |
| Oppenheim's sign | Oppenheim, Alexander | Oppenheim, Collins & Co. |
| Oppenheim, David | Oppenheim, Dennis | Oppenheim, James |
| Oppenheim, Jonathan | Oppenheim, Joseph | Oppenheim, Lassa |
| Oppenheim, Michael | Oppenheim, New York | Oppenheim, Paul |
| Oppenheim, Peter | Oppenheim, Samuel | Oppenheim-Union-Rennen |
| Oppenheimer | Oppenheimer & Co | Oppenheimer & Co. |
| Oppenheimer & Company | Oppenheimer (2023 film) | Oppenheimer (album) |
| Oppenheimer (band) | Oppenheimer (crater) | Oppenheimer (disambiguation) |
| Oppenheimer (film) | Oppenheimer (miniseries) | Oppenheimer (movie) |
| Oppenheimer (play) | Oppenheimer (soundtrack) | Oppenheimer (surname) |
| Oppenheimer (TV miniseries) | Oppenheimer (TV series) | Oppenheimer 2023 |
| Oppenheimer 2023 movie | Oppenheimer and Barbie | Oppenheimer and Co. |
| Oppenheimer Award | Oppenheimer Barbie | Oppenheimer baronets |
| Oppenheimer Baronets | Oppenheimer Beach | Oppenheimer Blue |
| Oppenheimer Capital LP | Oppenheimer Diamond | Oppenheimer empire |
| Oppenheimer film | Oppenheimer Funds | Oppenheimer Group |
| Oppenheimer Holdings | Oppenheimer Holdings Inc. | Oppenheimer House |
| Oppenheimer Management Corporation | Oppenheimer Memorial Trust Foundation | Oppenheimer movie |
| Oppenheimer Panel | Oppenheimer Park | Oppenheimer Park (Vancouver) |
| Oppenheimer pole | Oppenheimer security clearance hearing | Oppenheimer security hearing |
| Oppenheimer security hearings | Oppenheimer soundtrack | Oppenheimer Stadium |
| Oppenheimer Stadium disaster | Oppenheimer Stadium Disaster | Oppenheimer Strategies |
| Oppenheimer Study Center | Oppenheimer Toy Award | Oppenheimer v Cattermole |
| Oppenheimer, Anthony | Oppenheimer, David | Oppenheimer, Frank |
| Oppenheimer, George | Oppenheimer, Harry | Oppenheimer, Joel |
| Oppenheimer, Jonathan | Oppenheimer, Michael | Oppenheimer, Peter |
| Oppenheimer, Reuben | Oppenheimer, Samuel | Oppenheimer, Sarah |
| Oppenheimer, Stephen | Oppenheimer, Thomas | Oppenheimer-Phillips effect |
| Oppenheimer-Phillips process | Oppenheimer-Phillips reaction | Oppenheimer-Snyder model |
| Oppenheimer-Volkoff equation | Oppenheimer-Volkoff limit | Oppenheimer-Volkov equation |
| Oppenheimer-Volkov limit | Oppenheimer–Phillips process | Oppenheimer–Snyder model |
| Oppenheimer–Volkoff limit | OppenheimerFunds | Oppenheimerin tapaus |
| Oppenheimerite | Oppenhoff | Oppenhoff & Partner |
| Oppenhuizen | Oppenordt, Gilles-Marie | Oppens |
| Oppens (Vaud) | Oppens VD | Oppens, Switzerland |
| Oppenstein Brothers | Oppenstein Brothers Memorial Park | Oppenwehe Moor |
| Oppenweher Moor | Oppenweiler | Oppeo |
| Oppeo, California | Opper | Opper, John |
| Opper-Gelre | Oppera | Opperding |
| Opperdoes | Opperesion | Opperesson |
| Opperhoofd | Opperhoofd at Dejima | Opperhoofd in Japan |
| Opperhoofd of Mauritius | Opperhoofden | Opperhoved |
| Opperlandse taal- & letterkunde | Opperman | Opperman (disambiguation) |
| Opperman's conjecture | Opperman, Chris | Opperman, Frank |
| Opperman, George | Opperman, OH | Opperman, Ohio |
| Opperman, Paul | Oppermann | Oppermann Automobiles |
| Oppermann's conjecture | Oppermann, Thomas | Oppershausen |
| Oppersion | Oppert | Oppert Incident |
| Oppertshausen | Opperzau | Oppes |
| Oppetunity cost | Oppey Abbey | Oppeyoh |
| Oppeyoh, California | Oppfinnar Jocke | OPPG |
| OPPG (disambiguation) | OPPh3 | Opphaug |
| Opphaug (village) | Oppheim Church | Oppheimsvatnet |
| OPPI | OPPI (disambiguation) | Oppi A. J. Untracht |
| Oppi Untracht | Oppia | Oppia gens |
| Oppia microptera | Oppian | Oppian Hill |
| Oppian Law | Oppian of Anazarbus | Oppian of Apamea |
| Oppian of Corycus | Oppian of Syria | Oppianos |
| Oppianus | Oppida | Oppidan |
| Oppidan Scholar | Oppidans | Oppidia gens |
