Grades

• A1, a grade for the Leaving Certificate, a qualification in the education system of Ireland
• A1, the highest obtainable grade for the Sijil Pelajaran Malaysia examination in Malaysia
• A1, a grade for the Senior Secondary Certificate Examination in Nigeria, see Education in Nigeria
• A1, a grade for the Singaporean GCE 'O' Level, an examination in the education system of Singapore
• A-1, an Academic grading in Pakistan commonly used in the education system of Pakistan

Broadcasting

• A-One (TV channel), a Russian music channel
• A1 TV channel (Macedonia)
• A1 Report, a television station in Albania
• America One, an American television network
• A 1, see List of radio stations in Austria and Liechtenstein
• A1, a promotional name for CHIN (AM) radio 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

Film

• A-1 Headline, a 2004 Hong Kong film
• A 001, operazione Giamaica (Our Man in Jamaica), a 1965 Italian adventure film directed by Ernst R. von Theumer
• A1, a 1999 Syrian film, see List of Syrian films
• A1 (2019 film), Indian Tamil film

Companies

• A1 Film Company, a Burmese cinema company
• A-1 Pictures, a Japanese animation studio

Games

• A1 Games, an American video game publisher for the PlayStation; see List of PlayStation games (A–L)
• A1 – Slave Pits of the Undercity, a component of Scourge of the Slave Lords, and adventure module for the Dungeons & Dragons role-playing game
• Larsen's Opening, a chess move, A01 in ECO code
• A1, a square on a chessboard

Music and dance

• Aone Beats or Aone, music producer
• 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 (band), a British-Norwegian boy band
• Floyd "A1" Bentley, record producer and reality TV star (from Love & Hip Hop: Hollywood)
• A1 x J1, a British hip hop duo

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 (photographer)

Americas

• A-1 visa, a non-immigrant United States visa for governmental officials
• A1, an electoral alliance in Suriname, see List of political parties in Suriname

Asia

• A1, a class of South Korean visa
• A-1, a classification in the status of Indian cities

Europe

• A1, a rank in the European Civil Service
• A1, a town planning use class in England and Wales
• A1, a racial classification by law enforcement in England and Wales

Astronomy

• A1, a class of star, see stellar classification
• "A1" subobject designations, including:
  • NGC 3603-A1

Biology

• 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
• 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

Leagues or divisions

• A1 Ring, the former name for the Red Bull Ring, a motorsport circuit in Spielberg, Austria
• A1, a climbing grade
• A1, a ranking in Keirin track cycling
• Class A1 (baseball), a defunct classification within Minor League Baseball

Competition

• 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

Individuals

• A-1 (born 1977), Canadian professional wrestler

Computing

• A-1, a programming language that was a successor to the A-0 System written by Grace Hopper in the 1950s
• A1, codename for Windows Live OneCare
• A1, a class of computer security specified in the Trusted Computer System Evaluation Criteria
• Acer Aspire One netbook computer

Commercial brands and companies

• A1 Superlink, an Australian Internet service provider merged in 2000 into the Froggy (ISP)
• 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

Electronic products

• 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

Aircraft

• A-1 (airship)
• A-1 Skyraider
• Albastar A1, 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

Motorcycles

• A1, a Haden (motorcycle) frame
• A1, a Motosacoche motorcycle
• A-1, a 1976 Alligator (motorcycle)
• Automatic A1, a Tomos motorcycle
• A1 Samurai, see List of Kawasaki motorcycles

Roads

• Highways designated A1 in several countries; see List of A1 roads

Spacecraft

Trains and public transit

• A1 Steam Locomotive Trust, a charitable trust
• Ayrshire Bus Owners (A1 Service), a bus operator in Scotland
• 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, a 1901 Irish 4-4-0 passenger steam locomotives
• Nishi-magome Station, a Japanese subway station
• PRR A1, an American PRR steam locomotive
• Prussian A 1, a 1907 German Prussian railbus
• RER A1, 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 or California combination, an Electric tram type
• 0-2-2, the UIC classification for the Whyte notation of locomotive wheel arrangements