Lusitanian may refer to:
- Lusitanians, an ancient people of western Iberian Peninsula.
- Lusitanian language, the language of the ancient Lusitanians.
- Lusitanian mythology, the mythology of the ancient Lusitanians.
- Lusitanian War, the war between Ancient Rome and the ancient Lusitanians.
- Lusitania, a Roman province in western Iberian Peninsula.
- Lusitania, New Latin designation of Portugal.
- Something Portuguese.
- Lusitania, New Latin designation of Portugal.
- Lusitanian distribution, in biology, a type of disjunct distribution of certain species.