Aqua is the Latin word for water. It is sometimes as a prefix (such as aquaculture). It can also mean:
- Aqua is also used by web site designers as a different name for the web colour cyan; aqua is also used for aquamarine by graphic designers and interior designers.
- Aqua (Chicago), a skyscraper in Chicago. It is one of the tallest buildings in the world.
- Aqua (band), a band from Denmark