A1

A1, A-1, A01 or A.1. may refer to:

Film

 * A-1 Headline, a 2004 Hong Kong film
 * A 001, operazione Giamaica (English title: Our Man in Jamaica), a 1965 Italian film
 * A1, a 1999 Syrian film; see List of Syrian films
 * A1 (2019 film), Indian Tamil film

Games

 * A1 – Slave Pits of the Undercity, a component of Scourge of the Slave Lords adventure module for Dungeons & Dragons
 * Larsen's Opening (ECO code: A01), a chess move
 * A1, a square on a chessboard

Music and dance

 * A1, a part in contra dance choreography
 * A-1 Sound Studios, a recording studio owned by Herb Abramson
 * A-1, an American rap group behind the album Mash Confusion
 * A-One (band), a Mandopop group
 * A1 (group), a British–Norwegian boy band
 * A1 x J1, a British hip hop duo

Albums

 * A1, an album by Ertuğ Ergin
 * A1, an album by Tony Cetinski
 * A One, an album by Ayumi Hamasaki
 * A1 (album), a 2002 album by the British–Norwegian band A1

Radio

 * CHIN (AM) (promotional name: A1), a station in Canada
 * A1, a Slovenian radio network owned by Radiotelevizija Slovenija
 * A-1 Detective Agency, a fictional detective agency in the radio series I Love a Mystery

Publications

 * A1 (comics), a comics anthology
 * A-1 Comics, a 1944–1955 Golden Age comics publication
 * A1—The Great North Road, a book by Paul Graham

Television

 * A-One (TV channel), a Russian music channel
 * A1 Televizija, a former channel in the Republic of North Macedonia
 * A1 Report, a television station in Albania
 * America One, an American television network

Companies

 * A1 Film Company, a Burmese cinema company
 * A-1 Pictures, a Japanese animation studio
 * A1 Games, an American video game publisher for the PlayStation; see List of PlayStation games (A–L)
 * A1 Superlink, an Australian Internet service provider merged in 2000 into the ISP Froggy
 * A-1 Supply, a former name of American gaming machine manufacturer International Game Technology
 * A1 Telekom Austria, an Austrian mobile network operator, and its subsidiaries
 * A1 Slovenija, the second largest telecommunications company in Slovenia
 * A1 Bulgaria, mobile network operator in Bulgaria
 * A1 Hrvatska, mobile network operator in Croatia
 * A1 Belarus, mobile network operator in Belarus
 * A1 Srbija, mobile network operator in Serbia
 * A1 Macedonia, mobile network operator in North Macedonia
 * A1 Steam Locomotive Trust, a charitable trust
 * Ayrshire Bus Owners (A1 Service), a bus operator in Scotland

Education

 * A1, the Basic Language Certificate of the Common European Framework of Reference for Languages
 * Language A1, the former name for "Language A: literature", one of the IB Group 1 subjects
 * A1, a secondary school subdivision in the Congolese education system
 * A1, a baccalauréat series in the education system of some parts of France
 * A1, a baccalaureate in the Gabonese education system; see Education in Gabon
 * A1, the highest category of Qualified Flying Instructor in the Central Flying School of the UK Royal Air Force

Grades

 * A1, a grade for the Leaving Certificate, Ireland
 * A1, a grade for the Sijil Pelajaran Malaysia examination, Malaysia
 * A1, a grade for the Senior Secondary Certificate Examination; see Education in Nigeria
 * A1, a grade for the Singapore-Cambridge GCE Ordinary Level, Singapore
 * A-1, an academic grade in Pakistan

Finance

 * A1 or A-1, two investment grades for bonds
 * A1, a country risk rating assigned by Compagnie Française d'Assurance pour le Commerce Extérieur

Military

 * List of A1 weapons
 * A-1 Skyraider, a US military attack aircraft
 * A-1 flying jacket, the predecessor of the A-2 flying jacket
 * Company A-1, an outfit in the Texas A&M Corps of Cadets
 * Svea Artillery Regiment, a Swedish Army regiment
 * A-1 (code) was the designation for a code used by the United States Navy during World War I
 * A1, a designation of military staff in the continental staff system
 * A-1, a grade of Republic of China; see Orders, decorations, and medals of the Republic of China
 * Forces A1, a naval force in the Battle of Crete; see Crete order of battle
 * AMX International AMX (Brazilian Air Forces designation: A-1), an aircraft
 * Kampfgeschwader 53 (identification symbol: A1), a Luftwaffe bomber wing during World War II

People

 * A-1 (wrestler) (born 1977), Canadian professional wrestler
 * Floyd Bentley (born 1987), record producer and reality TV star also known as A1
 * Aone Beats or Aone, music producer

Politics and government

 * A-1 visa, a non-immigrant US visa for governmental officials
 * A1, an electoral alliance in Suriname; see List of political parties in Suriname
 * A1, a class of South Korean visa
 * A-1, a classification in the status of Indian cities
 * A1, a rank in the European Civil Service
 * A1, one of the planning use classes in England and Wales
 * A1, a classification of race by law enforcement in England and Wales

Places

 * A1 Mine Settlement, Victoria, Australia
 * Zone A1, a zone in the Alonissos Marine Park, North Aegean Sea, Greece

Astronomy

 * A1, a stellar classification
 * A1, a subobject designation; for example NGC 3603-A1

Biology

 * List of A1 genes, proteins or receptors
 * A1 broth, a substance used to detect fecal coliforms
 * ATC code A01 Stomatological preparations, a subgroup of the Anatomical Therapeutic Chemical Classification System
 * Combretastatin A1, a potent cytotoxic agent
 * HLA-A1, a human leukocyte antigen serotype
 * Proanthocyanidin A1, an A type proanthocyanidin
 * Primary auditory cortex, the region of the cerebral cortex where sound is processed
 * Vitamin A1, the animal form of vitamin A
 * A1, a segment of the anterior cerebral artery
 * A1, the first anal vein in the Comstock-Needham system of insect wing vein naming
 * Noradrenergic cell group A1
 * A1, a mating type of Phytophthora infestans, the cause of potato blight

Earth sciences

 * A1, a landslide classification factor
 * A-1, a class in the AASHTO Soil Classification System

Mathematics

 * A¹ homotopy theory, a concept related to algebraic topology
 * A1, an 1844 paper by mathematician Hermann Grassmann
 * A1, the alternating group on a set with one only element

Computing

 * A-1, a 1950s programming language successor to the A-0 System
 * Windows Live OneCare (codename: A1), former computer security software
 * A1, a class of computer security specified in the Trusted Computer System Evaluation Criteria
 * Acer Aspire One, a netbook computer

Electronics

 * Canon A-1, a 35 mm SLR camera manufactured from 1978 to 1985
 * Canon XH-A1, a handheld prosumer HDV camcorder released in 2007
 * Minolta Dimage A1, a digital camera produced in 2003
 * Sony HVR-A1, the prosumer version of the Sony HDR-HC1 camcorder, which was introduced in 2005
 * AVM A1-Card, an ISDN card produced by German company AVM GmbH
 * A1 VSTi, a 2002 synthesizer software program produced by Waldorf Music
 * Xiaomi Mi A1, a smartphone released in 2017, part of series Mi and Android One
 * Samsung Galaxy A01, a smartphone released in 2020

Other science and technology

 * A-1, the first series of Disney's Audio-Animatronics figures
 * KS 150 or A-1, a nuclear reactor in Czechoslovakia, decommissioned in 1979
 * A.1 scale, an atomic time scale in the International Atomic Time standard

Leagues or divisions

 * A1 sport league (disambiguation)
 * A1, a climbing grade
 * A1, a ranking in Keirin track cycling
 * Class A1 (baseball), a defunct classification within Minor League Baseball

Competitions

 * A1 (classification), an amputee sport classification
 * A1 Grand Prix, a motorsport racing series
 * A-1 Liga, the top basketball league in Croatia
 * HEBA A1, the top basketball league in Greece
 * Phase A1, a phase in a combined driving equestrian competition

Aircraft

 * List of A1 aircraft
 * A-1 (airship)
 * Douglas A-1 Skyraider
 * Albastar A1, a glider
 * Model 3 A-1, an Aeronautical Products rotorcraft, see List of rotorcraft

Cars

 * A1, a tyre code
 * A1 Grand Prix car
 * Anadol A1, a 1966 Turkish car
 * Arrows A1, a 1978 British racing car
 * Audi A1, a supermini automobile produced from 2010
 * Audi Quattro A1, a 1983 rally car
 * Chery A1
 * Scania A1, a 1901 car
 * Toyota A1, a 1935 car prototype
 * A1 registration plate, a UK vehicle registration plate
 * A1, a Volkswagen Group A platform
 * A-1, a 1939 Buick Roadmaster Series 81C used by Norwegian royalty

Maritime

 * A1 (shipping), a symbol indicating shipbuilding quality
 * Sea Area A1, a designation in the Global Maritime Distress Safety System

Surface vessels

 * A-1 lifeboat
 * USS A-1, several US Navy ships
 * ARA Comandante General Irigoyen (A-1), an Argentine Navy auxiliary ship

Submarines

 * HMS A1, a British A-class submarine of the Royal Navy
 * Type A1 submarine, a type of Japanese Navy submarine
 * HNoMS Kobben (A-1), a Royal Norwegian Navy submarine

Motorcycles

 * A1, a Haden frame
 * A1, a Motosacoche motorcycle
 * A-1, a 1976 Alligator
 * Automatic A1, a Tomos motorcycle
 * A1 Samurai, in the list of Kawasaki motorcycles

Roads

 * List of A1 roads

Satellites

 * A-001, the second abort test of the Apollo spacecraft
 * Anik A1, a Canadian satellite
 * Aussat (Optus) A1, a 1985 Australian telecommunications satellite
 * Orbcomm A1, a 1997 American low Earth orbit communications satellite
 * Palapa A1, the first 1976 Indonesian Palapa satellite
 * Superbird A1, a satellite put into orbit by an Ariane launch in 1992
 * Astérix (satellite) or A1, the first French satellite

Rockets

 * A1, a model of German Aggregate series rocket from World War II
 * Hermes A-1, a rocket in the Hermes project
 * Saturn A-1, a 1959 American rocket
 * Scout A-1, a 1965 American rocket

Trains and public transit

 * Bavarian A I, an 1844 German steam locomotive model
 * LB&SCR A1 class, a class of locomotives designed by Stroudley and known as the Terriers
 * LNER Gresley Classes A1 and A3, a locomotive class designed by Sir Nigel Gresley, including the Flying Scotsman
 * LNER Thompson Class A1/1, the rebuild of 4470 Great Northern by Edward Thompson
 * LNER Peppercorn Class A1, a class of Pacific locomotives designed by Arthur Peppercorn
 * NCC Class A1, 1901 Irish 4-4-0 passenger steam locomotives
 * Nishi-magome Station (station number: A-01), a Japanese subway station
 * Pennsylvania Railroad class A1, an American PRR steam locomotive
 * Prussian A 1, a 1907 German Prussian railbus
 * RER A1, a RER A rapid transit line in France
 * SP&S Class A1, a 1907 steam locomotives class
 * Tel Aviv–Jerusalem railway, built on the “A1 Route”
 * Type A1, a type of electric tram in Adelaide, Australia
 * 0-2-2 (UIC classification: A1), locomotive wheel arrangements

Other uses

 * A1 paper size (59.4×84.1 centimetres or 23.4×33.1 inches)
 * A.1. Sauce, a brand of brown sauce
 * A1, a colour grade used in shrimp marketing
 * Front of house engineer or A1, a type of sound operator