Blue Grotto may refer to:
- Blue Grotto (Biševo), a cave on the Croatian island of Biševo
- Blue Grotto (Capri), a cave on the Italian island of Capri
- Blue Cave (Kastellorizo), a cave on the Greek Island of Megisti (Kastelorizo)
- Blue Grotto (Malta), a cave in Malta
- Blue Grotto, an area under the Manhattan end of the Brooklyn Bridge
- Grotta dello Smeraldo, a cave at the Amalfi Coast in Italy
- Blue Grotto, a dive resort in Williston, Florida