DL, dL, or dl may stand for:
In science and technology
In electronics and computing
<dl></dl>, an HTML element used for a definition list- Deep learning, a branch of algorithm-based machine learning
- Description logics, a family of knowledge representation languages
- Delete Line (ANSI), an ANSI X3.64 escape sequence
- Digital library, a library in which collections are stored in digital formats
- Diode logic, a logic family using diodes
- DVD-R DL, a DVD Dual Layer engineering method
- DL register, the low byte of an X86 16-bit DX register
- Dynamic loading, a mechanism for a computer program to load a library
In telecommunications
- Data link, a computer connection for transmitting data
- Distribution list, a function of e-mail clients
- Downlink, the link from a satellite to a ground station
- Download, a transfer of electronic data
Vehicles
- Subaru DL, an automobile
- Australian National DL class, a class of diesel locomotives built by Clyde Engineering
- New Zealand DL class locomotive, a diesel-electric class built by Dalian Locomotive and Rolling Stock Company
- Destroyer leader, a large naval vessel capable of leading a flotilla
Other uses in science and technology
- Dimensionless quantity (dl, in lower case), the 'per unit' system of measurement
- Decilitre (or deciliter, dL), a unit of measurement of capacity or volume
- Discrete logarithms, in mathematics
- Distance learning, Internet-based education
- HPE ProLiant DL, density line servers
- Dextrorotation and levorotation or D/L nomenclature, used in naming chemical compounds
In arts and entertainment
- D.L. (play), a Bulgarian play
- DL series, a series of adventures and some supplementary material for the Advanced Dungeons & Dragons role playing game
- D. L. Hawkins, fictional character on the American television series Heroes
- D. L. Hughley (born 1963), American actor and comedian
- Directors Lounge, an ongoing Berlin-based film and media-art platform and/or its annual film festival
- Dominant leittonwechselklänge
In business
- Dai-ichi Life, an insurance company
- Delta Air Lines (IATA airline code: DL)
Railroads
- Delaware–Lackawanna Railroad in Pennsylvania, U.S.
- District line, a London Underground line
Places
- DL postcode area, Darlington, north-east England
- County Donegal, Ireland
- Detroit Lakes, Minnesota, US
In politics
- Democracy is Freedom – The Daisy, a former political party in Italy
- Drinking Liberally, a social organization that discusses politics in bars
- Liberal Democracy (France) (Démocratie Libérale), a former political party in France
- Rights and Freedom, a political party in Italy
In sports
- Defensive lineman, an American/Canadian football players position
- Disabled list, the former name of the injury list, a list of injured baseball players
- Duckworth–Lewis method, a mathematical way to calculate the target score in cricket
- Deadlift, an Olympic powerlifting move
Other uses
- Deputy Lieutenant, a British title
- Diaper lover, a fetish
- Dimension Lengthwise, an International standard size of an envelope (110mm × 220mm, holds ⅓ A4)
- Doctor of Letters, a university degree
- Down-low (disambiguation)
- Driver's license, an official document which states that a person may operate a motorized vehicle
- Number 550, in Roman numerals