A6

A6 or A-6 can refer to:

; roads
* A6 road (England), connecting Luton with Carlisle
* A6 road (Isle of Man), a short primary road which connects Douglas with the A5
* A6 road (Northern Ireland), a road in Northern Ireland, connecting Belfast with Derry
* A6 road (Zimbabwe), running from Beitbridge to Bulawayo
*
* A006, National Route A006 (Argentina); highways :
* A6 (Croatia), a highway connecting Rijeka and Zagreb in Croatia
* A6 highway (Lithuania); motorways :
* A6 autoroute (France), a road in France, connecting Paris and Lyon
* Autostrada A6 (Poland), a motorway in Poland, near Szczecin
* Autovía A-6, a motorway connecting Madrid and A Coruña (Galicia)
* A6, the Bundesautobahn 6 in Germany, also known as Via Carolina
* A6, the Nordostautobahn in Austria
* A6 motorway (Cyprus), connecting Paphos to Limassol
* A6 motorway (Luxembourg), connecting the Belgian A4 to Luxembourg City
* A6 motorway (Netherlands)
* a national road in Latvia

; vehicles :
* A-6 Intruder, a twin-engine, mid-wing attack aircraft manufactured by Grumman, in service from 1962 to 1997
* Audi A6, an executive luxury car produced by Audi from 1994 to present
* HMS "A6", a British A class submarine of the Royal Navy, built around 1903
* Maserati A6, various Italian cars
* Prussian A 6, a 1913 German railbus
* "A6", an aggregate series (A1 to A12) German rocket design in World War II, never implemented
* "A-6", formerly the USS "Porpoise" (SS-7), a Plunger class submarine of the United States Navy, built in 1900

;other things :
* "A6", an ISO 216 international standard paper size (105×148 mm)
* "A6", or A (musical note) "above" soprano C, the highest note written or acknowledged as musical in classical music
* A6, the designation for air force headquarters staff concerned with signals, communications or information technology
** In the United Kingdom, the A6 Air CIS (Computers & Information Systems) branch, also known as JFACHQ, UK Joint Force Air Component Headquarters
* A6 steel, an older standard structural tool steel
* A6, the name of a disease in the short story "Night Surf" by Stephen King
* A-6, a renamed version of the US Security Group in the 1997 comic book movie "Spawn"
* A6, the IATA code for Air Alps Aviation
* Xenopus A6 kidney epithelial cells in cell culture
* a climbing grade
* United Arab Emirates aircraft registration code

A 6 may refer to :
* a Swedish regiment, according to the list of Swedish artillery regiments

A06

* ATC code A06, a division of the Anatomical Therapeutic Chemical Classification System
* HMNZS Monowai (A06), a 1975 Royal New Zealand Navy hydrographic survey vessel
* Réti Opening code in the Encyclopaedia of Chess Openings
* A.06, a track title on Linkin Park Underground Linkin Park fan club compilation