A1

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

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

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

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

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

Earth sciences

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

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

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

Physics

• A-1 (nuclear reactor), the second Soviet reactor

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
• Lely Astronaut A1, the first version of the Astronaut robot manufactured by Lely

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, an American single-seat attack aircraft
• Albastar A1, a glider
• Model 3 A-1, an Aeronautical Products rotorcraft, see List of rotorcraft
• Antigravity A1, a Chinese teleoperated quadcopter drone produced by Antigravity, a subsidiary of Insta360

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

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

Spacecraft

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