DL, dL, or dl may stand for:
- Measurement of volume
- the symbol of the decilitre (or deciliter), an SI unit of measurement of capacity or volume (1 dL = 100 mL)
- Science and tech
- Data link, a computer connection for transmitting data
- Discrete logarithms
- Description logics, a family of knowledge representation languages
- Digital library
- Diode logic, a logic family using diodes
- Distance Learning, a type of computer-based training (CBT) that uses Internet technology and consists of application software on the Web
- Distribution list, a function of e-mail clients
- Downlink, the link from a satellite to a ground station
- Download, a transfer of electronic data
- DVD-R DL, the DVD Dual Layer engineering method
- DL register, the low byte of an X86 16-bit DX register
- The D/L nomenclature 9Monosaccharide#The_D.2FL_nomenclature), used in the naming of sugars
- Culture
- Dead Letters, a 2003 album by The Rasmus
- Dragonlance, a series of fantasy novels
- Ratchet: Deadlocked, a platform/shooter video game
- People
- D. L. Hughley (born 1963), American actor and comedian
- Diogenes Laertius (fl. c. 3rd century AD), Greek biographer of the philosophers
- David Letterman (born 1947), American television host and comedian
- Damon Lindelof (born 1973), American television writer and executive
- David Livingstone (1813-1873), Scottish medical missionary and explorer
- Dave Lombardo (born 1965), Cuban American heavy metal drummer
- Demi Lovato (born 1992), American singer-songwriter and actress
- David Lynch (born 1946), American filmmaker
Fictional:
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- D. L. Hawkins, character from the American television series Heroes
- Dave Lister (fictional character), character from the British television series Red Dwarf
- Industry and organisations
- Subaru DL, an automobile
- The Dai-ichi Mutual Life Insurance Company, an insurance company
- Delaware-Lackawanna Railroad in Pennsylvania, U.S.
- the IATA code for Delta Air Lines
- Democracy is Freedom – The Daisy, a former Italian political party
- Démocratie Libérale, a political party in France
- Disneyland Park (Anaheim), a theme park
- Drinking Liberally, a social organization that discusses politics in bars
- Driver's license, an official document which states that a person may operate a motorized vehicle
- Sport
- Disabled list, a list of injured baseball players
- Duckworth-Lewis method, a mathematical way to calculate the target score in cricket
- Other
- 550 in Roman numerals
- Deputy Lieutenant, a British title
- Destroyer leader, a military (naval) initialism and hull classification symbol for a large destroyer capable of leading a flotilla
- Diaper lover, a fetish
- Dimension Lengthwise, an ISO paper size 110mm × 220mm commonly used for envelopes
- Distance Learning, a field of education
- District line, a London Underground line
- Doctor of Letters, a university degree
- Donald Land, a Famicom action game featuring Ronald McDonald
- County Donegal, Ireland
- Double lift, sleight of hand used in card magic
- Down-low (sexual slang), a slang phrase
- New Zealand DL class locomotive, a New Zealand locomotive class manufactured by Dalian Locomotive and Rolling Stock Company