O
- (Province of Catanduanes) Obo
- (Province of Albay) Ogob
- (Province of Catanduanes) Ogbong
- (Province of Camarines Sur) Ogbon
- (Province of Sorsogon) Ogao
- (Province of Catanduanes) Oga
- (Province of Camarines Sur) Odoc
- (Province of Catanduanes) Oco
- (Province of Camarines Sur) Ocini
- (Province of Camarines Sur) Ocata Island
- (Province of Catanduanes) Obo
- (Province of Camarines Sur) Otoc
- (Province of Albay) Obaliw
- (Province of Albay) Oas
- (Province of Sorsogon) Oyango
- (Province of Camarines Sur) Obo
- (Province of Sorsogon) Orolaid
- (Province of Sorsogon) Otalahib
- (Province of Sorsogon) Olandia
- (Province of Albay) Oringon
- (Province of Camarines Sur) Olag Pequeño
- (Province of Masbate) Otod
- (Province of Catanduanes) Osmena
- (Province of Masbate) Osmeña
- (Province of Camarines Sur) Oroc-Osoc
- (Province of Camarines Sur) Oring
- (Province of Sorsogon) Oras
- (Province of Sorsogon) Orangñi
- (Province of Camarines Norte) Oñgos
- (Province of Albay) Ongo