ICF
- Coupling Facility
- FIDE
- ICF Colony
- ICF International
- ICF coach
- Idiopathic chronic fatigue
- Immunodeficiency, centromere instability and facial anomalies syndrome
- Inertial confinement fusion
- Institut Català de Finances
- Insulating concrete form
- Integral Coach Factory
- Inter City Firm
- Inter-School Christian Fellowship
- Intermediate Care Facility
- International Cablemakers Federation
- International Canoe Federation
- International Carrom Federation
- International Christian Fellowship
- International Classification of Functioning, Disability and Health
- International Coaching Federation
- International Congress on Fracture
- International Cremation Federation
- Internet Connection Firewall
- Intracellular fluid
- Irish Cycling Federation
- Island Corridor Foundation
- World Curling Federation