IRA: Insurance Regulatory Authority
IRBM: Intermediate Range Ballistic Missile
IREP: Integrated Rural Energy Planning
IRS: Indian Remote Sensing Satellite; Indian Revenue Service
ISAF: International Stabilization and Assistance Force (in Afghanistan)
ISC: Inter-State Council
ISCS: Integrated Smart Card System
ISD: International Subscriber Dialled (telephone)
ISH: Information Super Highway
ISKCON: International Society for Krishna Consciousness
ISO: International Standardisation Organisation
ISP: Internet Service Provider
ISRO: Indian Space Research Organisation
ISS: International Space Station
IST: Indian Standard Time
ISTRAC: ISRO Telemetry, Tracking and Command Network
ITDC: Indian Tourism Development Corporation
ITO: International Trade Organisation; Income-tax Officer
ITU: International Tele-communication Union
IUC: Interconnect User Charge
J, K, L
JCO: Junior Commissioned Officer
JNNURM: Jawahar Lal Nehru National Urban Renewal Mission
JPC: Joint Parliamentary Committee
JPEG: Joint Photographic Experts Group
JWG: Joint Working Group
KG: Kindergarten
Kg: Kilogramme
KPO: Knowledge Process Outsourcing
LAC: Line of Actual Control
LCA: Light Combat Aircraft