CIA: Central Intelligence Agency (of U.S.A.)
CIBIL: Credit Information Bureau (India) Ltd
CIC: Chief Information Commissioner
CID: Criminal Investigation Department
C-in-C: Commander-in-Chief
cif: cost, insurance and freight
CIS: Commonwealth of Independent States
CISF: Central Industrial Security Force
CITES: Convention on International Trade in Endangered Species
CITU: Centre of Indian Trade Unions
CLASS: Computer Literacy and Studies in Schools
CLAWS: Centre for Land Warfare Studies
CM: Command Module; Chief Minister
CMP: Common Minimum Programme
CNG: Compressed Natural Gas
CNN: Cable News Network
CNS: Chief of the Naval Staff
CO: Commanding Officer
COD: Central Ordnance Depot; Cash on Delivery
CPCB: Central Pollution Control Board
CPI: Communist Party of India
CPI(M): Communist Party of India (Marxists)
CPU: Central Processing Unit
CR: Central Railway
CRAC: Cyber Regulation Advisory Council
CRDi: Common Rail Direct injection
CRISIL: Credit Rating Information Services of India Limited
CRM: Customer Relationship Management
CRR: Cash Reserve Ratio
CRPF: Central Reserve Police Force
CSIR: Council of Scientific and Industrial Research
CTBT: Comprehensive Test Ban Treaty
CTT: Commodities Transaction Tax
CVRDE: Combat Vehicles Research and Development Establishment
D
DA: Dearness Allowance; Daily Allowance
DAVP: Directorate of Advertising and Visual Publicity
DC: Deputy Commissioner; Direct Current in Electricity
DDT: Dichloro-Diphenyl Trichloro-ethane (disinfectant)
DIN: Director Information Number
DM: District Magistrate; Deputy Minister
DMIC: Delhi-Mumbai Industrial Corridor
DMK: Dravida Munnetra Kazhagam (a regional political party of Tamil Nadu)
DNA: de-oxyribonucleic acid
DO: Demi-official (letter)
DOD: Department of Ocean Development
DPEP: District Primary Education Programme
DPI: Director of Public Instruction
DRAM: Dynamic Random Access Memory
DRDO: Defence Research and Development Organisation
DST: Daylight Saving Time
DRES: Department of Renewable Energy Sources
DTH: Direct to Home (broadcasting)