EOR

EOR could refer to:


 * Earth Orbit Rendezvous, a proposed method for space missions to the Moon
 * Electric orbit raising, a method in space technology of reaching higher orbits by means of electric propulsion
 * Electro-optic rectification, a non-linear optical process
 * Employer of record, a co-employment company
 * Enhanced oil recovery, a term in petroleum production
 * Epping Ongar Railway, a heritage railway in England
 * European ordering rules, a standard to put words or names into sequence
 * Exclusive or, the exclusive disjunction in logic
 * Epoch of Reionization, a process that reionized matter in the universe.
 * Economics of Religion, a field of study using economics to understand religion
 * the IOC country code for the IOC Refugee Olympic Team at the 2020 Summer Olympics
 * the character Eeyore from the Winnie the Pooh series.