A5

A5 and variants may refer to:

==Science and technology== 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