Regions of Philippines
- Owayon Creek
- Owang River
- Owanan
- Owakan
- Owak
- Owak
- Owak
- Owak
- Owak
- Cuac
- Ilayang Owain
- Ibabang Owain
- Owacan
- Owac
- Outlet Bay
- Ouou
- Opsan
- Otzizla River
- Mount Otunao
- Otukan
- Otpegon Point
- Otayan
- Oton Bank
- Oton
- Oton
- Oton
- Otol
- Otol
- Otod River
- Otod
- Otod
- Otod
- Otod
- Otoc Point
- Otoc
- Otoc
- Otin
- Otiela
- Oticon River
- Oticon
- Otejon River
- Cutcuton
- Utabi
- Otama River
- Otama
- Otabon
- Osteng Shoal
- Osorio
- Osorio
- Mount Osoguen
- Oso
- Osmeña Student
- Osmena
- Osmeña
- Osmeña
- Osmeña
- Osmeña
- Osmeña
- Osmeña
- Osmeña
- Osmeña
- Osmena
- Osmeña
- Osmeña
- Osmeña
- Osmeña
- Osmeña
- Osmeña
- Osmena
- Osman
- Oslob Point
- Oslob
- Oslob
- Oslao
- Osio
- Osine River
- Osiem
- Osias
- Osiao
- Mount Osdung
- Oscariz
- Osboy
- Osanin Creek
- Ortoc
- Ortega
- Ortega
- Oroquieta River
- Oroquieta City
- Oroquieta
- Orong
- Oroc-Osoc
- Oroc-oroc River
- Mount Oroc
- Mount Oro
- Oro
- Ormoc Shoal
- Ormoc City
- Ormoc Bay
- Ormocay
- Ormocay
- Ormoc
- Orista Island
- Orioung
- Orion River
- Orion Hill
- Orion
- Orion
- Mount Oriod
- Orinoria
- Oring
- Oring
- Orina Creek
- Oregon Rock
- Origon Islet
- Oribi
- Orence
- Orell Island
- Ordoñez Bank
- Ordnance Point
- Mount Orcog
- Oras River
- Oras Hill
- Oras Bay
- Oras
- Oras
- Oras
- Orani River
- Orani River
- Orani
- Orani
- Orangñi
- Orang Mouth
- Orandang
- Orandang
- Oracon
- Ora
- Oquendo Viejo
- Oqendo River
- Oquendo
- Oquendo
- Opung
- Opul
- Opsan
- Opow Point
- Opong River
- Small Tinago Island
- Opong Bay
- Opong
- Opong
- Opong
- Opong
- Opon Channel
- Opong
- Opol Point
- Opol
- Opol
- Opoc Creek
- Oples
- Oples
- Oplas
- Opias
- Opaw
- Opao River
- Opao
- Opao
- Opao
- Opao
- Opang
- Oot Point
- Mount Opow
- O-Ong
- Mount Ooncaan
- Ugong
- Oobi
- Ontgol Point
- Ontambo
- Onop
- Onom
- Onipa River
- Oñgos
- Ongong River
- Ongong River
- Ongong
- Ongol
- Ongo
- Ongo
- Onglo
- Ongca
- Ongao River
- Ogale Point
- One-fathom Patch
- Ondoy River
- Ondoy
- Ondol River
- Ondol
- Ondol
- Once
- Onay
- Onate Rock
- Unat