IOD or Iod may refer to:
Ignition off draw, the drawing of electric current in a vehicle while shut off Indian Ocean Dipole, an irregular oscillation of sea surface temperatures Institute of Directors, a British professional organisation Institute of Directors (India), an Indian professional organisation Interactive Orbit Determination, a data reporting format for satellite observation International One Design, a sailboat designed in the 1930s Iod (river), a river in Romania, tributary of the Mureș Iod, a village in the commune Răstolița, Mureș County, Romania Inititial Orbit Determination I/O Die