O
- (Ratnapura District) Omalpe
- (Ratnapura District) Opanayakegoda
- (Ratnapura District) Owilanda
- (Ratnapura District) Owitigama
- (Ratnapura District) Olyabibile
- (Ratnapura District) Obokka
- (Kegalle District) Oddape
- (Ratnapura District) Okanmulla
- (Kegalle District) Olagama
- (Ratnapura District) Olitenna
- (Ratnapura District) Olugala
- (Ratnapura District) Oluganthota
- (Kegalle District) Ovitawara
- (Ratnapura District) Opanayaka
- (Ratnapura District) Opata
- (Ratnapura District) Opatha
- (Kegalle District) Opatha
- (Kegalle District) Othapitiya
- (Ratnapura District) Owala Kudabage
- (Ratnapura District) Owala Mahabage
- (Kegalle District) Owatta
- (Kegalle District) Owatta
- (Ratnapura District) Owatura
- (Kegalle District) Owitigamuwa