Aqualung may refer to:

• Aqua-Lung, a generic name used in the past to refer to a scuba diving regulator, particularly the original double-hose models
• Aqualung Group, a French manufacturer of diving equipment
• Aqualung America, a US subsidiary of the French company

• Aqualung (musician) or Matt Hales (born 1972), British musician, or his eponymous 2002 album
• Aqualung (album), 1971, or its 2005 live album Aqualung Live, by Jethro Tull
• "Aqualung" (song), a 1971 song by Jethro Tull
• "Aqualung", a song by Spooky from the album Gargantuan (album), 1993
• "Aqualung", a song by Morcheeba from Charango (album), 2002
• "Aqualung", a song by Miss Li from the album A Woman's Guide to Survival, 2017

• Aquahung, a former name for the Bronx River in New York
• Dryptosaurus aquilunguis, a dinosaur