Marine is an adjective relating to the sea or ocean.
The term "marine" can also refer to:
1. A member of a marine corps (e.g. U.S. Marine)
2. Marine biology - the scientific study of organisms in the ocean
3. Marine engineering - engineering concerning boats, ships, and other marine vessels
4. Marine insurance - insurance covering ships and cargo at sea
5. Marine organisms - plants and animals that live in saltwater environments