Neptunia may refer to:
*
''Neptunia'' (plant), a genus of plants within the subfamily Mimoseae
*
Neptunia (''Darkwing Duck''), a cartoon character in the television series ''Darkwing Duck''
*, an Italian coaster
*''
Hyperdimension Neptunia'', a video game series
**
''Hyperdimension Neptunia'' (video game), a 2010 role-playing video game, the first game in the series
* ''Neptunia'', a Roman colony at
Taranto, Italy
*
Neptunia, Uruguay, a resort location in Canelones Department, Uruguay
{{disambig, geo