GCM

GCM may refer to:

Awards

 * Good Conduct Medal (United States), a military award
 * Grand Cross of the Order of Merit (Portugal)
 * Knight Grand Cross Royal Order of Monisaraphon, post-nominal letters

Organizations

 * GCM Resources, a British mining company
 * Global Campaign for Microbicides
 * Great Commission Ministries, an American Christian evangelistic organization
 * Great Central Mines, a defunct Australian mining company

Science and technology

 * Galois/Counter Mode, in cryptography
 * General circulation model, or global climate model
 * Google Cloud Messaging
 * Greatest common measure
 * Ground continuity monitor

Transport

 * Claremore Regional Airport, in Oklahoma (FAA LID code)
 * Owen Roberts International Airport, Grand Cayman, Cayman Islands (IATA code)
 * Grand Central Madison, a commuter rail terminal

Other uses

 * Global Compact for Migration, a proposed international treaty
 * Grand Corps Malade (born 1977), French slam poet
 * Gross combination mass
 * Genesis Climber MOSPEADA, a Japanese animated TV series