GCR (or GCRS) may refer to:

Science

* Galactic cosmic ray, a cosmic ray from outside the Solar System * Geocentric Celestial Reference System, a coordinate system for near-Earth objects like satellites * Geological Conservation Review, a procedure of the British Joint Nature Conservation Committee * Global catastrophic risk, a potential catastrophe that would affect the whole world * '' Global Competitiveness Report'', a yearly report published by the World Economic Forum * Glucocorticoid receptor, a cell protein which responds to glucocorticoid compounds

Technology

* Gas-cooled reactor, a type of nuclear reactor * Ghost-canceling reference, a television subsignal * Grey component replacement, substitution of black ink for gray ink in color printing * Group coded recording, a technique for encoding digital data on magnetic tape or disk

Transportation

* GCR, ICAO code for Tianjin Airlines, China * GCR, stock symbol for Gaylord Container Corporation, an American packing material manufacturer * Great Central Railway, a British railway company ** Great Central Railway (heritage railway) ** Great Central Railway (Nottingham)

Other uses

* Glass City Rollers, an American roller derby league * Graduate Common Room, a Common Room (university) for postgraduate students * Global Corruption Report by Transparency International * Gray City Rebels, a Brazilian roller derby league * Green Corn Revival, an American band * gcr, ISO 639-3 code for the French Guianese Creole language * ' (Revolutionary Communist Group (Lebanon)), a Lebanese Trotskyite group {{disambiguation