E8

E8 may refer to:

Mathematics

E₈ (mathematics), an exceptional simple Lie group with root lattice of rank 8, or its Lie algebra ${\mathfrak {e}}_{8}$
E₈ lattice, special lattice in R⁸
E₈ manifold, mathematical object with no smooth structure or topological triangulation
E₈ polytope, alternate name for the 4₂₁ semiregular (uniform) polytope
Elementary abelian group of order 8

E₈ Theory, term sometimes loosely used to refer to An Exceptionally Simple Theory of Everything

E-8 Joint STARS, a retired USAF command and control aircraft
EMD E8, 1949 diesel passenger train locomotive
European route E8, part of the international E-road network, running between Tromsø, Norway and Turku, Finland
European walking route E8, a walking route from Ireland to Turkey
HMS E8, 1912 British E class submarine
London Buses route E8, runs between Ealing Broadway station and Brentford
Mikoyan-Gurevich Ye-8, 1962 supersonic jet fighter developed in the Soviet Union
E8, IATA code for the former Alpi Eagles airline
E8, IATA code for City Airways
Spyker E8, Spyker Cars model
Hokuriku Expressway, route E8 in Japan
East Coast Expressway and Kuala Lumpur–Karak Expressway, route E8 in Malaysia
E8 Series Shinkansen, a Japanese high-speed train to be introduced in 2024

Empire 8, intercollegiate athletic conference affiliated with the NCAA's Division III
E-8 (rank), an enlisted rank in the military of the United States
E8, baseball scorekeeping abbreviation for an error on the center fielder
E8, postcode district in the London E postcode area