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
• {{MV|Neptunia}}, 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

• The Chanels
• The Change (Animorphs)
• The Change in Me
• The Changeling (1980 film)
• The Changeling (LaValle novel)
• The Changeling (TV series)
• The Changeling (Ōe)
• The changes in pearl milk tea
• The Changes of Life
• The channel magazine
• The Channel Nine Show
• The Channel Tank
• The Chansons de Biletis
• The Chantic Bird
• The Chantry House
• The Chaos Engine 1
• The Chaos Engine I
• The Chaos Engine II
• The Chapel of Sacred Mirrors
• The Chaperone (2018 film)
• The Chaperone (film)
• The Chaperone (upcoming film)
• The Chaplain of San Lorenzo
• Thechapmagazine.co.uk
• The Chapo Guide to Revolution