O
- (Province of Iloilo) Odiongan
- (Province of Antique) Oloc
- (Province of Iloilo) Olo-Baroc
- (Province of Negros Occidental) Olmo
- (Province of Negros Occidental) Old Tarazona
- (Province of Negros Occidental) Old Sagay
- (Province of Iloilo) Olango
- (Province of Iloilo) Ojastras Island
- (Province of Aklan) Ogsip
- (Province of Iloilo) Odioñgan
- (Province of Iloilo) Oyuñgan
- (Province of Antique) Odiong
- (Province of Iloilo) Oyungan
- (Province of Antique) Opao
- (Province of Aklan) Odiong Norte
- (Province of Aklan) Odiong Sur
- (Province of Capiz) Olo Pangabat
- (Province of Iloilo) Omio
- (Province of Capiz) Olalo
- (Province of Negros Occidental) Omambe
- (Province of Iloilo) Oluangan
- (Province of Antique) Ouiligdon
- (Province of Capiz) Oyong
- (Province of Iloilo) Oya-oy
- (Province of Iloilo) Oyanoyan
- (Province of Iloilo) Owak
- (Province of Antique) Opsan
- (Province of Negros Occidental) Otod
- (Province of Antique) Osorio
- (Province of Antique) Osorio