A5

A5 and variants may refer to:

Science and mathematics

A5 regulatory sequence in biochemistry
A5, the abbreviation for the androgen Androstenediol
Annexin A5, a human cellular protein
ATC code A05 Bile and liver therapy, a subgroup of the Anatomical Therapeutic Chemical Classification System
British NVC community A5 (Ceratophyllum demersum community), a British Isles plants community
Subfamily A5, a Rhodopsin-like receptors subfamily
Noradrenergic cell group A5, a noradrenergic cell group located in the Pons
A5 pod, a name given to a group of orcas (Orcinus orca) found off the coast of British Columbia, Canada
A5, the strain at fracture of a material as measured with a load test on a cylindrical body of length 5 times its diameter
A₅, the alternating group on five elements
Zeolite A-5, a calcium-type molecular sieve also known as 5A.

A5 road, in several countries
Hall-Scott A-5, an engine powering the 1916 Standard H-2 aircraft
Prussian A 5, a 1913 German railbus
Route A5 (WMATA), a bus route operated by the Washington Metropolitan Area Transit Authority
Airlinair, by IATA code
Bhutan, by aircraft registration code
ICON A5, an American amphibious aircraft
Pennsylvania Railroad class A5s, an American locomotive
Finnish Steam Locomotive Class A5
LNER Class A5, a class of 4-6-2T steam locomotives

A-5, an export version of Nanchang Q-5, a Chinese-built jet fighter bomber
Curtiss Falcon or A-5 Falcon, an attack aircraft manufactured by the Curtiss Aircraft Company
Mitsubishi A5M, a 1930s Japanese fighter plane
A-5 Vigilante, a carrier-based supersonic bomber designed for the United States Navy
Focke-Wulf A 5, a World War I German Focke-Wulf aircraft
Sturzkampfgeschwader 1, from its historic Geschwaderkennung code with the Luftwaffe in World War II

USS A-5 (SS-6) or USS Pike (SS-6), a 1903 United States Navy Plunger-class submarine
HMS A5, an A-class submarine of the Royal Navy
Aggregate 5, a German rocket design, scaled down precursor to the V-2, in World War II
A 5, a Swedish regiment designation, see list of Swedish artillery regiments
A5, the staff designation for air force headquarters staff concerned with plans or strategy
- In the United Kingdom, the Joint Force Air Component Headquarters A5 - Air Strategy and GAT branch
A5 Juggernaut, an armored fighting vehicle in the Star Wars fictional universe

A5 paper size, an ISO 216 international standard paper size (148 × 210 mm)
A5, the highest grade of Japanese wagyu beef
In Town and country planning in the United Kingdom, A5 is the code for permission to use specific land or premises for takeaways