The German Einheitsminen (EM) mine series consisted of 13 different types of sea mines. These types were designated EMA, EMB, EMC, EMD, EME, EMF, EMH, EMI, EMK, EMR, EMS, and EMU. With the exception of the EMS, which was a drifting mine, all of the series were moored laid by surface and/or underwater craft.

The EMH, EMI, EMK and EMU either were abandoned in the developmental stage or were incomplete at the close of the war, and no specimens of any of these types or documents relating thereto were found. Consequently the information contained herein on such mines is based solely on statements made by German prisoners of war and should be treated accordingly.