| Otus mindorensis | Ouagadougou | Oud |
| Oude | Oudh | Oule |
| Oulx | Oum Hadjer | Oupis |
| Our Beloved Revolutionary Sweetheart | Our Father | Our Lady of Assumption College |
| Our Lady of Atonement Cathedral | Our Lady of Death | Our Lady of Fatima University |
| Our Lady of Guadalupe | Our Lady of Guadalupe Colleges | Our Lady of Lourdes College |
| Our Lady of Lourdes Technological College | Our Lady of Peñafrancia | Our Lady of Perpetual Succor College |
| Our Lady of Salambao | Our Lady of Salambaw | Our Lady of Sorrows |
| Our Lady of Succour | Our Lady of the Holy Rosary | Our Lady of the Most Holy Rosary |
| Our Lady of the Pillar College | Our Mother of Perpetual Help | Our Mother of Succour |
| Ouran High School Host Club | Ourano | Ouranos |
| Ouranus | Ourikel | Ourista |
| Ouro Preto | Ouroboros | Out |
| Out of the Races and Onto the Tracks | Out of Time | Out! |
| Outer space | Outer space exploration | Outer-space |
| Outerspace | Outismo | Outlaw |
| Outrageous and Courageous | Outreach | Outriaz |
| Outrigger | Outrigging | Outs |
| Ouwrista | Ova | OVA |
| Ovada | Oval | Oval (estadyo) |
| Ovarian follicle | Ovary | Ovejas (Sucre) |
| Over the Rainbow | Overgrazing | Overland Park, Kansas |
| Overpass | Overpass (estilo ng titik) | Overseas Filipino |
| Overseas Filipinos | Overseas Workers Welfare Administration | Overweight |
| Overweight child | Overweight children | Ovibos moschatus |
| Ovid | Ovidio | Ovidius |
| Oviduct | Oviducts | Oviglio |
| Ovilla Technical College | Ovindoli | Ovis orientalis |
| Ovodda | Ovulación | Ovulacion |
| Ovulate | Ovulation | Ovum |
| Owani, Aomori | Owariasahi | Owariasahi, Aichi |
| Owariasahi, Aitsi | Owase, Mie | Owe My Love |
| Owen Lovejoy | Owk | Owk (lungsod) |
| Owl | Owl City | Owrikel |
| Owrista | Owt | Owtismo |
| Owts | Owusu Kizito | Ox |
| Ox (zodiac) | Ox-like | Oxalis triangularis |
| Oxen | Oxford English Dictionary | Oxford–AstraZeneca |
| Oxfordian Colleges | Oxfordianong Dalubhasaan | Oxfordianong Kolehiyo |
| Oxlike | Oxnard, California | Oxter |
| Oxycoccos | Oxygen | Oxygen atom |
| Oxygeno | Oxyrhynchus Papyri | Oxyura vittata |
| Oyabe, Toyama | Oyace | Oyama, Shizuoka |
| Oyama, Tochigi | Oyama, Totsigi | Oyamazaki, Kyoto |
| Oyayi | Oynmenta | Oyntment |
| Oyntmente | Oyntmento | Oyo Sotto |
| Oyodo, Nara | Oyonnax | Oyster |
| Oyster Island | Ozamis City | Ozamiz |
| Ozamiz City | Ozan, Ain | Ozegna |
| Ozherelye | Ozias | Ozieri |
| Ozone | Ozone (singaw) | Ozone depletion |
| Ozone layer | Ozymandias | Ozyorsk, Chelyabinsk Oblast |
| Ozyorsk, Kaliningrad Oblast | Ozyory | Ozzano dell'Emilia |
| Ozzano Monferrato | Ozzero | Ӱ |
| Հայաստան | Հայաստանի Հանրապետություն | P |
| P & G | P anisum | P antarcticum |
| P B S Pinchback | P Blaud | P Blaud de Beaucaire |
| P Blaud ng Beaucaire | P Blaud of Beaucaire | P cinereus |
| P concolor | P dactylifera | P E |
| P electra | P gangetica | P gangetica gangetica |
| P gangetica minor | P haliaetus | P indicus |
| P montanus | P N P | P onca |
| P pardus | P pelagicus | P peltatum |
| P pubis | P saltatrix | P sanguinolentus |
| P sanguinotentus | P serrulata | P stirtoni |
| P tigris tigris | P&G | P&g |
| P'yŏngyang | P-Pop | P. anisum |
| P. antarcticum | P. B. S. Pinchback | P. Blaud |
| P. Blaud de Beaucaire | P. Blaud ng Beaucaire | P. Blaud of Beaucaire |
| P. cinereus | P. concolor | P. dactylifera |
| P. E. | P. E. Winfield | P. electra |
| P. G. Wodehouse | P. gangetica | P. gangetica gangetica |
| P. gangetica minor | P. Gannavaram | P. haliaetus |
| P. I. A. | P. indicus | P. K. van der Byl |
| P. Kalimuthu | P. L. M. | P. M. Pimsleur |
| P. montanus | P. N. P. | P. onca |
| P. pardus | P. pelagicus | P. peltatum |
| P. Pimsleur | P. pubis | P. R. Thippeswamy |
| P. saltatrix | P. sanguinolentus | P. sanguinotentus |
| P. sativa | P. serrulata | P. stirtoni |
| P. T. Barnum | P. tigris tigris | P. umbilicalis |
| P. vera | P. Zamora | P.3 |
| P.B.S. Pinchback | P.E. | P.F. Alviar, Vintar, Ilocos Norte |
| P.I. | P.I.A. | P.L.M. |
| P.L.O. | P.M. Pimsleur | P.N.P. |
| P.O.5 | P.S. I Love You | Pa |
| Pa-arawan | Pa-eksrey | Pa-oo |
| Pa-sigsag | Pa-X-rey | Paa |
| Paa ng atleta | Paagusan | Paalalahanan |
| Paalam Amerika | Paalsahin | Paaminin |
| Paanakan | Paanakin | Paano |
| Paano Ba Ang Mangarap? | Paano gamitin ang arnis | Paano Kaya Kung Tayo |
| Paano Kita Lilimutin | Paano kumantot | Paano magiging kasapi ng katipunan |
| Paano magseks | Paano makipagseks | Paano makipagtalik |
| Paano malalaman ang isang Tunay na Kaibigan | Paano naging itim ang uwak | Paano naging pangulo si quirino |
| Paano Naging Puwedeng Kainin ang Lansones | Paano naging pwedeng kainin ang lansones | Paano nakarating ang mga negrito sa pilipinas |
| Paano nasakop ng hapon ang pilipinas | Paano Pinakasalan ng Diyablo ang Tatlong Mag-aate | Paano Tatakasan ang Bukas (1988 film) |
| Paano Tatakasan ang Bukas? | Paano Tatakasan ang Bukas? (1988 film) | Paano Tumulong ang Ermitanyo Upang Mapanaluhan ang Anak na Babae ng Hari |
| Paano Yumaman si Suan | Paano-gawin | Paanong Naging Ligtas Kainin ang Lansones |
| Paaralan | Paaralan ng mga siniko | Paaralan ng Santa Maria |
