An office of emergency management (OEM), alternatively called an emergency management office (EMO), or an emergency management agency (EMA) in some areas, is an agency at the local, tribal, state, federal, or international level that holds responsibility for comprehensively planning for and responding to and recovering from all manner of disasters, whether man-made or natural. An OEM may also be requested to provide consequence management for large special events such as major gatherings, visiting dignitaries, damage assessment following a disaster, etc.
This list is not comprehensive and simply covers several major OEMs.