Neptunia may refer to:
*
''Neptunia'' (plant), a genus of plants within the subfamily Mimoseae
* ''Neptunia'' (gastropod), an emendation of ''
Neptunea'', a genus of sea snails
*
Neptunia (''Darkwing Duck''), a cartoon character in the television series ''Darkwing Duck''
*
Neptunia, Uruguay, a resort location in Canelones Department, Uruguay
*, an Italian liner launched in 1931
*, an Italian tanker launched in 1945
* ''
Hyperdimension Neptunia'', a video game series
* ''Neptunia'', a Roman colony at
Taranto
Taranto (; ; previously called Tarent in English) is a coastal city in Apulia, Southern Italy. It is the capital of the province of Taranto, serving as an important commercial port as well as the main Italian naval base.
Founded by Spartans ...
, Italy
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