O
- (Province of Romblon) Oyan
- (Province of Romblon) Olango
- (Province of Palawan) Oyster Island
- (Oriental Mindoro) Oara
- (Province of Palawan) Ocam Ocam
- (Province of Palawan) Oco Island
- (Province of Palawan) Oson Island
- (Oriental Mindoro) Odiong
- (Oriental Mindoro) Oem
- (Province of Marinduque) Ogbac
- (Province of Palawan) Okayan
- (Province of Palawan) Olasi
- (Province of Palawan) Olorga
- (Province of Palawan) Ongong
- (Province of Romblon) Origon Islet
- (Province of Romblon) Otod
- (Province of Palawan) Oton
- (Occidental Mindoro) Otayan
- (Occidental Mindoro) Odala
- (Oriental Mindoro) Odiong
- (Province of Palawan) Osmeña
- (Province of Romblon) Odiongan