E77

E77 may refer to:
 * King's Indian Defense, Encyclopaedia of Chess Openings code
 * European route E77, an international road
 * E 77 road (United Arab Emirates)
 * E77 balloon bomb, an American anti-crop biological munition
 * DRG Class E 77, a German locomotive class
 * San Manuel Airport FAA code near San Manuel, Arizona, United States
 * Kyushu Chūō Expressway, route E77 in Japan