O
- (Province of Aklan) Osman
- (Province of Iloilo) Orinoria
- (Province of Capiz) Olotayan
- (Province of Capiz) Olotayan Island
- (Province of Iloilo) Omambong
- (Province of Iloilo) Omio
- (Province of Capiz) Ongol
- (Province of Iloilo) Onop
- (Province of Aklan) Oquendo
- (Province of Aklan) Ortega
- (Province of Aklan) Ondoy
- (Province of Guimaras) Oracon
- (Province of Negros Occidental) Ogtongon
- (Province of Aklan) Ochanado
- (Province of Aklan) Odiong
- (Province of Negros Occidental) Odiong
- (Province of Negros Occidental) Orong
- (Province of Iloilo) Oton