Ocean World can mean several things:
- Ocean world, an astronomical body possessing a significant amount of water
- Hycean planet, an astronomical body covered in water with a hydrogen atmosphere
- Oceanworld Manly, a theme park
- "Ocean World" is an episode of The Blue Planet
- Ocean World (water park), a water park in South Korea
- Ocean World, an aquarium in Crescent City, California
- Ocean Worlds Exploration Program at NASA