| ICSI | Industrial Catalysis Science and Innovation 
| Others |
| ICSI | Innovation, Commitment, Satisfaction, and Integrity
| Others |
| ICSI | Institute for Clinical Systems Improvement
| Others |
| ICSI | Institute for Critical Social Inquiry
| Others |
| ICSI | Institute of Company Secretaries of India
| Others |
| ICSI | Integrated Circuit Solution Incorporation
| Others |
| ICSI | International Commission on Snow and Ice
| Others |
| ICSI | International Computer Science Institute
| Others |
| ICSI | International Computer Services Incorporated
| Others |
| ICSI | International Conference on Systems Integration
| Others |
| ICSI | International Consumer Support for Infertility
| Others |
| ICSI | International Cyber Security Institute
| Others |
| ICSI | Intra Cytoplasmic Sperm Injection
| Others |
| ICSI | Intra-Cytoplasmic Sperm Injection
| Others |
| ICSI | Intracytoplasmic Sperm Injection
| Others |