A method is presented for direct visualization of electromagnetic microfields. Using a transmission electron microscope equipped with a field‐emission electron gun and two electron biprisms, an object wave and two reference waves are superposed to interfere for producing a new type of interference pattern in which electromagnetic fields are directly observed. Equal‐potential lines of an electric field around a latex particle and magnetic flux lines emerging from a barium ferrite particle have been observed. ©1995 American Institute of Physics.