E56

E56 may refer to:
 * European route E56
 * HMS E56
 * Nimzo-Indian Defence, Encyclopaedia of Chess Openings code
 * Kōchi Expressway (between Kochi IC and Shimantocho-chuo IC), Nakamura-Sukumo Road and Matsuyama Expressway (between Matsuyama IC and Tsushimawa-Matsu IC), route E56 in Japan