# A1

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

## Arts and entertainment
### 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
* A-One (graffiti artist) (born 1964) American graffiti artist

## 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

## Science and technology
### 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
* A$_1$, 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 introduced 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

## Sports
### 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

## Transportation
### 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

### Spacecraft
#### 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
* A1, a train model uses in Guangzhou Metro

## 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