A2, A02, A002, A², A.II or A-2 may refer to:

• British NVC community A2 (Lemna minor community), a plant community
• A2, the second anal vein in the Comstock-Needham system of insect wing segment naming

• A-box 2 of insulin gene
• HLA-A2, a human MHC HLA-A serotype gene
• Ectodysplasin A2 receptor, a protein that in humans is encoded by the EDA2R gene
• Alpha-2 adrenergic receptor
• Annexin A2, a protein
• Apolipoprotein A-II, a protein
• Phospholipase A2, an enzyme
• Prokaryotic phospholipase A2, an enzyme
• Hemoglobin A2, a protein
• Proanthocyanidin A2, an A type proanthocyanidin
• Urea transporter A2, a protein
• A2, a variant of blood groups alleles A in the ABO blood group system
• A2, a subfamily of rhodopsin-like receptors

• ATC code A02 Drugs for acid related disorders, a subgroup of the Anatomical Therapeutic Chemical Classification System
• Brachydactyly type A2, a disease
• Noradrenergic cell group A2

• A-2 (programming language), a follow-on to the A-0 System used on UNIVAC I
• A2 (operating system), software to run a computer

• DiMAGE A2, a digital camera produced by Minolta
• IBM A2, an IBM processor used in its supercomputers
• Cowon A2, a portable multimedia player from Cowon

• A2 Secret of the Slavers Stockade, a module in the Scourge of the Slave Lords series for Dungeons & Dragons
• Final Fantasy Tactics A2: Grimoire of the Rift

• Biu-Mandara A.2 languages, an Afro-Asiatic family of languages spoken in Nigeria
• A2, a second language level in the IB Group 2 subjects
• A2, a level in the Common European Framework of Reference for Languages

• A-2 jacket, a leather flight jacket
• A2, the military staff designation in the continental staff system for air force headquarters staff concerned with intelligence and security
• A 2, Göta Artillery Regiment designation, a former Swedish Army artillery regiment

• A due, a musical term often abbreviated to a2
• A2, a rock band that performed the song "Chosen One" in the video game Shadow the Hedgehog^{[citation needed]}

• A2 (classification), an amputee sport classification
• HEBA A2, a Greek basketball league
• A2 volleyball league (Portugal)
• A2 women's volleyball league (Portugal)
• A2, an Italian Baseball League
• A2, an Italian Volleyball League
• A2, a grade in climbing

• A2 (remote television production), a person who manages audio equipment
• A2 Stereo or Zweikanalton, a television broadcasting system
• A2 Teema, a panel discussion episode of Ajankohtainen kakkonen, a Finnish television series
• A2, common abbreviation of Antenne 2, former name (1975–1992) of French national television station France 2

• A-2 Savage or AJ Savage, an aircraft
• Abrial A-2 Vautour, a French sailplane built in 1925
• Antonov A-2, a Soviet glider
• Breda A.2, a 1921 Italian aircraft
• Fokker A.II, a German aircraft
• Nikol A-2, 1939 a prototype of a Polish amphibious flying boat
• Pfalz A.II, a German Idflieg A-class designation aircraft
• Reaction Engines A2, a design study for a hypersonic airliner under development
• Cielos Airlines's IATA code
• A-2, United States Navy alphanumeric code for the North American AJ Savage carrier-launched bomber
• A2, a Botswana aircraft registration code

• Bavarian A II, an 1847 German steam locomotive model
• LNER Class A2, a class of steam locomotives
• LNER Peppercorn Class A2, a class of steam locomotives
• LNER Thompson Class A2, 3 classes of Pacific locomotives
• Milwaukee Road class A2, a 1901 4-4-2 type steam locomotive
• SP&S Class A2, an 1887 steam locomotives class
• Victorian Railways A2 class, a 1907 Australian steam locomotive
• PRR A2, a Pennsylvania Railroad locomotive classification
• Prussian A 2, a Prussian railbus model

• List of A2 roads
• Anadol A2, a 1970 Turkish car
• Arrows A2, a 1979 British racing car
• Audi A2, a 1999 automobile
• Merzario A2, see template:F1 cars 1979
• Route A2 (WMATA), a bus route operated by the Washington Metropolitan Area Transit Authority
• Audi Quattro A2, a 1984 rally car evolution of the Audi Quattro

• HMS A2, a Royal Navy A-class submarine
• Type A2 submarine, a submarine of the Imperial Japanese Navy during World War II
• T2-SE-A2, a type of oil tanker constructed and produced in large quantities in the United States during World War II
• Sea Area A2, as defined under the GMDSS system

• Saturn A-2, a 1959 American rocket
• A-002, the third abort test of the Apollo spacecraft
• Aussat (Optus) A2, a 1985 Australian satellite

• M1A2, a version of the American M1 Abrams tank
• M60A2, a version of the American M60 Patton tank

• A2 (rocket), a German rocket design (1934)
• AUG A2 Commando, a variant of the Austrian Steyr AUG rifle
• M16A2 rifle, a variant of the M16 rifle of the United States Army
• AR-15A2, a variant of the Colt AR-15 rifle
• M16A2 mine, a variant of the M16 mine of the United States Army
• Polaris A-2, a variant of the Polaris missile of the United States Navy

• A2 (theater), a person who manages audio equipment
• DIN4102 A2, a flammability rating for materials ~98% noncombustible
• A2-level, an education qualification in England, Wales and Northern Ireland
• A2 milk, a trademark of the A2 Corporation
• Radio Station A2, a radio station in Lithuania
• A-2 tool steel, an air-hardening SAE grade of tool steel
• A-2 visa, a document given to officials representing a foreign government inside the United States of America
• Agence de l'innovation industrielle (AII), a French governmental agency for technological projects
• Ann Arbor, Michigan, often referred to as A2 or A²
• Bird's Opening's Encyclopaedia of Chess Openings code
• A2, an international standard paper size
• A2 or SAE 304, a grade of stainless steel for fasteners
• A2, a UK Town and Country Planning use class
• A II, a painting by László Moholy-Nagy, painted in 1924
• Sea Area A2, a GMDSS system area
• YoRHa Type A No. 2, or A2, a character from the video game Nier: Automata
• Lely Astronaut A2, the second version of the Astronaut robot manufactured by Lely
• AgiBot A2, a humanoid robot made by AgiBot

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