A13 or A-13 may refer to:
Biology
- ATC code A13 Tonics, a subgroup of the Anatomical Therapeutic Chemical Classification System
- British NVC community A13 (Potamogeton perfoliatus - Myriophyllum alterniflorum community)
- Subfamily A13, a rhodopsin-like receptors subfamily
Transportation
- A13 road, in several countries
- Archambault A13, a French sailboat design
- Antonov A-13, a 1958 Soviet acrobatic sailplane
- Chery A13, a subcompact car
- , a British A-class submarine of the Royal Navy
- Northrop YA-13, a 1930s American attack aircraft prototype
- A-13 (tank), the General Staff specification covering three British cruiser tanks designed and built before and during the Second World War
- Cruiser Mk III
- Cruiser Mk IV
- Covenanter tank
Other uses
- A13, one of the Encyclopaedia of Chess Openings codes for the English Opening in chess
- Apple A13, a system on a chip mobile processor designed by Apple
- Samsung Galaxy A13, a smartphone manufactured by Samsung Electronics