- Oceans
- ocean salinity energy
- ocean salinity gradient power generation
- ocean Satellite
- ocean satellite
- ocean scientific drilling
- ocean shadow zone
- Ocean shipping
- ocean sociology
- ocean sound channel
- ocean sound field fluctuation
- ocean sounding plotting sheet
- ocean storm exploration
- ocean stratification
- ocean surface wave
- ocean surveillance satellite
- ocean survey ship
- ocean technology
- ocean test bed
- ocean test technology
- ocean thermal energy
- ocean thermal energy conversion
- ocean tidal energy
- ocean tide
- ocean tide gauge