A9

A9, A.9, A09, A 9 or A-9 may refer to

==Science== ATC code A09 Digestives, including enzymes, a subgroup of the Anatomical Therapeutic Chemical Classification System Biolimus A9, an immunosuppressant British NVC community A9, the Potamogeton natans community, one of the aquatic communities of the British National Vegetation Classification HLA-A9, a broad antigen serogroup of Human MHC HLA-A Subfamily A9, a Rhodopsin-like receptors subfamily