E6

E6, E06, E.VI or E-6 can mean:

* E₆, a Lie group in mathematics
* E₆ polytope in geometry
* E-6 Mercury, a US Navy derivative of the Boeing 707
* E-6 process, a common photographic process for developing transparency film
* E6 - protein, a protein encoded by Human papillomavirus which inhibits P53
* E-6 (rank), the sixth rank of enlisted soldier in the US armed services--a Staff Sergeant in the Army and Marines, a petty officer, 1st class in the Navy, and a Technical Sergeant in the Air Force
* EMD E6, a diesel locomotive
* European route E6, a European highway route
* Honda E6, one of the predecessors of Honda's ASIMO robot
* LB&SCR E6 class, a British
* London Buses route E6, a Transport for London contracted bus route
* London E6, the postcode for East Ham in London
* Motorola ROKR E6, a 2006 multimedia phone model
* Pfalz E.VI, a WWI German aircraft powered by the Oberursel U.I engine
* PRR E6, a 4-4-2 steam locomotive

Other uses include:
* The Elephant 6 Recording Company, a collective of independent American musicians
* Electric Six, a Detroit rock band
* The E6 series of preferred numbers for electronic components
* E6, the first note of the whistle register
* E6, an extremely severe grade in the British rock climbing grading system
* E06, Thyroiditis ICD-10 code