| ICSF | Imperial College Union Science Fiction, Fantasy and Horror Society 
| Others |
| ICSF | Indonesian Calya Sigra Family
| Others |
| ICSF | InfoDev Conference Scholarship Fund
| Others |
| ICSF | Inner-City Scholarship Fund
| Others |
| ICSF | Institute for Computer Security and Forensics
| Others |
| ICSF | Integrated Command Communications System Framework
| Others |
| ICSF | Integrated Cryptographic Service Facility
| Others |
| ICSF | International Casting Sport Federation
| Others |
| ICSF | International Children's Surgical Foundation
| Others |
| ICSF | International Collective in Support of Fishworkers
| Others |
| ICSF | Internet Child Safety Foundation
| Others |
| ICSF | Internet Connection Sharing and Firewall
| Others |
| ICSF | Ironton City Schools Foundation
| Others |
| ICSF | Islamic Center of San Francisco
| Others |
| ICSF | Italian Canadian Sports Federation
| Others |
| ICSF | Ivy Community Service Foundation of Cary
| Others |