O
- (Province of Samar) Old Manunca
- (Province of Samar) Odoc
- (Province of Samar) Odoc
- (Province of Samar) Oeste - A
- (Province of Leyte) Oguis
- (Province of Leyte) Ohaon
- (Province of Northern Samar) Ohio
- (Province of Samar) Olayan
- (Province of Samar) Old Mahayag
- (Province of Leyte) Odiongan
- (Province of Northern Samar) Old Rizal
- (Province of Samar) Old San Agustin
- (Province of Samar) Olera
- (Province of Northern Samar) Oleras
- (Province of Southern Leyte) Olisijan
- (Biliran) Ol-og
- (Province of Eastern Samar) Omauas
- (Province of Samar) Obo
- (Province of Southern Leyte) Odiong
- (Province of Samar) Occidental
- (Province of Samar) Obrevo
- (Province of Samar) Obo-ob
- (Province of Southern Leyte) Obongobong
- (Province of Samar) Obayan
- (Province of Samar) Oacon Islands
- (Province of Samar) Obrero
- (Province of Northern Samar) Omaga
- (Province of Northern Samar) Old Bucala Island
- (Province of Northern Samar) Oson
- (Province of Northern Samar) Omagis