E9

E9 or E-9 may refer to:

Roads and trails

 * European route E09
 * European walking route E9
 * E9, the Besraya Expressway in Malaysia
 * Kyoto Jūkan Expressway, San'in Kinki Expressway and San'in Expressway, route E9 in Japan

Vehicles

 * BMW E9, a two-door coupé built for BMW by Karmann from 1968 to 1975
 * EMD E9, a diesel locomotive
 * E-9A Widget, U.S. Air Force range control aircraft

Other uses

 * E9 (countries) a forum of nine highly populated countries
 * E9 (Lie algebra) (E9), another name for the infinite dimensional affine Lie algebra
 * E9 tuning, a common tuning for steel guitar necks of more than six strings
 * E9, a baseball scorekeeping abbreviation for an error on the right fielder
 * E9, a postcode district in the E postcode area of the London postal district
 * Boston-Maine Airways IATA code
 * E-9, a U.S. uniformed services pay grade