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 Trotskyist group