- Sacramento River ports (9)
- Saint John River ports (1)
- Salween River ports (1)
- San Joaquin River ports (1)
- Saskatchewan River ports (2)
- Sassandra River ports (1)
- Savannah River ports (2)
- Seine River ports (1)
- Sénégal River ports (1)
- Shatt al Arab River ports (4)
- Snake River ports (3)
- Songhua (Sungari) River ports (1)
- Soroksari Duna River ports (1)
- St. Clair River ports (9)
- St. Lawrence River ports (6)
- Suez Canal River ports (7)
- Svernaya Dvina River ports (1)
