E23

E23 may refer to:
 * BMW E23
 * British submarine HMS E23
 * European route E23
 * Sprint Expressway, a major expressway in Kuala Lumpur (designated as in the Malaysian Expressway System)
 * Nimzo-Indian Defense, Encyclopaedia of Chess Openings code
 * Higashi-Meihan Expressway and Ise Expressway, route E23 in Japan
 * Citybus Route E23 in Hong Kong