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
See also 9E (disambiguation)