HL may refer to:

In arts and entertainment

* ''Half-Life'' (series), a video game series by Valve ** ''Half-Life'' (video game), the first game in that series * ''

Horseland ''Horseland'' was an online community and browser game where members took care of, bred, trained and showed horses and dogs. Begun in 1994 in the United States, Horseland had grown to have more than 8 million users who played from all over the wor ...

'', an online community and virtual game * ''

Harry Styles Harry Edward Styles (born 1 February 1994) is an English singer, songwriter, and actor. His showmanship, artistry, and flamboyant fashion have had a Cultural impact of Harry Styles, significant impact on popular culture. Styles's musical ca ...

'' and ''

Louis Tomlinson Louis William Tomlinson ( ; born 24 December 1991) is an English singer, songwriter, and fashion designer. Born and raised in Doncaster, England, Tomlinson auditioned for British singing competition ''The X Factor'' as a solo artist in 2010, w ...

'', part of the popular boyband ''

One Direction One Direction, often shortened to 1D, were an English-Irish pop boy band formed in London in 2010. The group consisted of Niall Horan, Zayn Malik (until his departure in 2015), Liam Payne, Harry Styles, and Louis Tomlinson. The group sold o ...

'' known as HL when referred to together

Businesses

* Hangars Liquides, an electronic music label *

Hargreaves Lansdown Hargreaves Lansdown Limited is a British financial services company based in Bristol, England. It sells funds, shares and related products to retail investors in the United Kingdom. It is the largest investment platform in the UK. The company wa ...

, a British investment company *

Hitachi-LG Data Storage Hitachi-LG Data Storage (HLDS, HL-DT-ST or H-L Data Storage), a 51-49 joint venture between Hitachi, Hitachi, Ltd. and LG Electronics, is a manufacturer of DVD and Blu-ray optical disc drives for desktop computers and laptops. Founded in late 2000 ...

, an optical disc drive manufacturer *

Hogan Lovells Hogan Lovells ( ) is an American-British law firm co-headquartered in London and Washington, DC. The firm was formed in 2010 by the merger of the American law firm Hogan & Hartson and the British law firm Lovells. As of 2024, the firm employed a ...

, an international law firm *

Houlihan Lokey Houlihan Lokey, Inc., is an American multinational independent investment bank and financial services company. Houlihan Lokey was founded in 1972 and is headquartered at Constellation Place in Century City, Los Angeles, California. The firm ad ...

, an international investment bank *

Hovedstadens Lokalbaner Hovedstadens Lokalbaner () is a Denmark, Danish company formed in 2002 that owns the trains and tracks of several local railways around Copenhagen: Frederiksværkbanen, Gribskovbanen, Hornbækbanen, Lille Nord, Nærumbanen and Østbanen (Denmark), ...

, a Danish local railway company *

HL Group HL Group (), formerly Halla Group, is a South Korean chaebol that engages in automobile, construction, distribution/port, investment, education, and sports businesses in Korea and internationally. Its construction business comprises the provision ...

, a South Korean company

In linguistics

* , a Latin-script digraph * Reduction of /hl/ to /l/ in Old/Middle English *

Voiceless alveolar lateral fricative The voiceless alveolar lateral fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents voiceless dental, alveolar, and postalveolar lateral fricatives is , a ...

, a sound sometimes represented as

Science, technology, and mathematics

* HL gas, a mixture of

sulfur mustard Mustard gas or sulfur mustard are names commonly used for the organosulfur chemical compound bis(2-chloroethyl) sulfide, which has the chemical structure S(CH2CH2Cl)2, as well as other species. In the wider sense, compounds with the substituen ...

and lewisite *

Half-life Half-life is a mathematical and scientific description of exponential or gradual decay. Half-life, half life or halflife may also refer to: Film * Half-Life (film), ''Half-Life'' (film), a 2008 independent film by Jennifer Phang * ''Half Life: ...

, in nuclear physics *

Hectolitre The litre ( Commonwealth spelling) or liter (American spelling) (SI symbols L and l, other symbol used: ℓ) is a metric unit of volume. It is equal to 1 cubic decimetre (dm3), 1000 cubic centimetres (cm3) or 0.001 cubic metres (m3). A cub ...

, a unit of volume * Hessdalen light, an unexplained light seen in Norway *

Hodgkin's lymphoma Hodgkin lymphoma (HL) is a type of lymphoma in which cancer originates from a specific type of white blood cell called lymphocytes, where multinucleated Reed–Sternberg cells (RS cells) are present in the lymph nodes. The condition was named a ...

, a highly treatable hematological malignancy ("blood cancer") *

Hotline A hotline is a Point-to-point (telecommunications), point-to-point information transfer, communications Data link, link in which a telephone call, call is automatically directed to the preselected destination without any additional action by t ...

, a telecommunications link *

Hydrogen line The hydrogen line, 21 centimeter line, or H I line is a spectral line that is created by a change in the energy state of solitary, electrically neutral hydrogen atoms. It is produced by a spin-flip transition, which means the dire ...

, a spectral line *

Hypotenuse Leg In geometry, two figures or objects are congruent if they have the same shape and size, or if one has the same shape and size as the mirror image of the other. More formally, two sets of points are called congruent if, and only if, one can be t ...

, a postulate of geometry * HL, an amateur radio call sign prefix in South Korea

Other uses

Hueiyen Lanpao The Hueiyen Lanpao (), often abbreviated as HL, is an Indian Meitei language daily newspaper circulated mainly in the Northeast Indian state of Manipur. As Meitei language is written in both Meitei script and Bengali script, the Hueiyen Lanpao ...

, a Meitei-English bilingual newspaper of Manipur *

Croatian Labourists – Labour Party The Croatian Labourists–Labour Party () is a centre-left political party in Croatia. It was formed in 2010 by a former trade unionist and People's Party MP Dragutin Lesar, who was the party's only member of parliament in the 6th assembly. I ...

(Croatian: '), a political party in Croatia *

Headline The headline is the text indicating the content or nature of the article below it, typically by providing a form of brief summary of its contents. The large type ''front page headline'' did not come into use until the late 19th century when incre ...

, a text indicating the nature of the article below it *

Heilongjiang Heilongjiang is a province in northeast China. It is the northernmost and easternmost province of the country and contains China's northernmost point (in Mohe City along the Amur) and easternmost point (at the confluence of the Amur and Us ...

, a province of China (Guobiao abbreviation HL) *

Hit list (disambiguation) Hit list or The Hit List may refer to: * A list of would-be victims in contract killing * Record chart, a ranking of recorded music according to popularity during a given period of time Film and TV * ''Hit List'' (1989 film), starring Jan-Michae ...

House of Lords The House of Lords is the upper house of the Parliament of the United Kingdom. Like the lower house, the House of Commons of the United Kingdom, House of Commons, it meets in the Palace of Westminster in London, England. One of the oldest ext ...

, the upper house of the Parliament of the United Kingdom * Higher Level, a level of course difficulty in the

International Baccalaureate Diploma Programme The International Baccalaureate Diploma Programme (IBDP) is a two-year educational programme primarily aimed at 16-to-19-year-olds in 140 countries around the world. The programme provides an internationally accepted qualification for entry int ...

Hong Kong Higher Level Examination The Hong Kong Higher Level Examination (HKHLE; ) was a public examination taken by students in Hong Kong at the end of Form 6 (Lower Sixth), in preparation for entry to The Chinese University of Hong Kong (CUHK), which then offered four-year cou ...

, a standardized examination from 1979 to 1992 {{disambiguation