QL may mean:
- the NATO code for the chemical isopropyl aminoethylmethyl phosphonite, a precursor to the nerve agent VX
- The Philips QL, an induction lighting system by Philips
- Quake Live, a first-person shooter video game in development by id Software
- Queen Latifah, an American rapper
- Sinclair QL, a 1980s home and personal computer by Sinclair Research Ltd
- Bedford QL, a three-ton military 4x4 truck
- The IATA airline designator of Aero Lanka
- Quantum Leap (TV series), a television program
- Quadratus lumborum, a muscle in the lower back
- Le Québécois Libre, a political webzine
- ATCvet code QL Antineoplastic and immunomodulating agents, a section of the Anatomical Therapeutic Chemical Classification System for veterinary medicinal products
- Query language