AQ, Aq, aQ, or aq may refer to:
Aquaman is a fictional superhero appearing in American comic books published by DC Comics. Created by Paul Norris and Mort Weisinger, the character debuted in More Fun Comics #73 (November 1941).
Aquaman has made several appearances in numerous media and has been referenced beyond the scope of traditional comics superhero entertainment.
An aquarium (plural: aquariums or aquaria) is a vivarium of any size having at least one transparent side in which water-dwelling plants or animals are kept and displayed.
Aquaculture, also known as aquafarming, is the farming of fish, crustaceans, molluscs, aquatic plants, algae, and other aquatic organisms.
Aqaba (English pronunciation: /ˈækəbə/; Arabic: العقبة) is the only coastal city in Jordan and the largest and most populous city on the Gulf of Aqaba.
The aquaculture of salmonids is the farming and harvesting of salmonids under controlled conditions for both commercial and recreational purposes.
An aquifer is an underground layer of water-bearing permeable rock, rock fractures or unconsolidated materials (gravel, sand, or silt) from which groundwater can be extracted using a water well.