E12

E12 or E-12 may refer to:

Science, technology and mathematics

 * the E12 series of preferred numbers
 * E12 screw, a type of Edison screw
 * the code name for Microsoft Exchange Server 2007
 * Siding Spring Survey code

Roads and trails

 * European route E12
 * E12 European long distance path
 * Ampang–Kuala Lumpur Elevated Highway (AKLEH), a fully elevated expressway in Kuala Lumpur, Malaysia

Vehicles

 * BMW E12
 * HMS E12, a United Kingdom Royal Navy submarine which saw service during World War I
 * Spyker E12, a Dutch Spyker car

Other uses

 * Queen's Indian Defense, Encyclopaedia of Chess Openings code
 * E12, a postcode district in the E postcode area
 * E-12 equal temperament consisting of twelve equal semitones per octave