- Santiago
- Santo Niño
- Sapa
- Sayagan Island
- Sayak
- Sayao Island
- Siana
- Siargao Island
- Siargao Islands
- Sibahay
- Sibale Island
- Sibanac Island
- Sibukuan Island
- Silop
- Singag Island
- Siwata
- Small Kababacan Island
- Small Tinago Island
- Sogas
- Solion
- Somilihon
- Somosomo
- Songkit
- Soriano
- Sua Island
- Sua Islets
- Sugbu Diutay Islet
- Sugbu Islet
- Sugbuhan Island
- Suhoton