C3I may refer to: Command, Control, Communications and intelligence, a military abbreviation Command, Control, Communications and Information, a British military abbreviation The C3I Programme, an initiative of London's Metropolitan Police Service Christian City Churches International, an Australia-based evangelical movement C3i, a GMT Games magazine published by Rodger B. MacGowan 3CI - Comradeship, Commitment, Courage and Integrity, a New Zealand military abbreviation