OEC

OEC may refer to:

Finance

 * The Observatory of Economic Complexity, a data visualization site
 * Ordre des Experts-Comptables, French association of chartered accountants

Transportation

 * Orion Expedition Cruises, Australian based luxury expedition cruise line
 * Otis Elevator Company, an American company that manufactures vertical transportation systems
 * Osborn Engineering Company, known as OEC, an historic British former manufacturer of motorcycles

Other

 * Odd Eye Circle, a South Korean girl group
 * Offshore Energy Center, sponsor of the Ocean Star Offshore Drilling Rig & Museum in Galveston, Texas, United States
 * Old Earth creationism, a term for several types of creationism
 * Olfactory ensheathing cells, a type of glial cell found in the nervous system
 * Oregon Environmental Council, an American environmental organization
 * Orissa Engineering College, a technical institution in Bhubaneswar, Orissa, India
 * Outdoor Emergency Care, a course for certification of first aid in non-urban situations
 * Overseas Employment Certificate, an identity document in the Philippines
 * Oxford English Corpus, an English text corpus
 * Oxygen evolving complex, a water oxidizing enzyme
 * .OEC, the file format for OE-Cake!, a fluid physics software application