E&M

E&M may stand for:


 * E and M signaling, a type of supervisory line signaling that uses DC signals on separate leads
 * Encrypt-and-MAC (E&M), an approach to authenticated encryption
 * Electromagnetism, sometimes also called electricity and magnetism, a branch of physics
 * Electromechanics, combines electrical engineering and mechanical engineering
 * Evaluation and Management Coding, a medical billing process in the United States
 * Exchange and Mart, a defunct long-established British sales publication


 * Mechatronics, a portmanteau of electronics and mechanics