| International Songwriting Competition | Academic & Science |
| Indira School of Communication | Academic & Science |
| International Students Club | Academic & Science |
| Index of Social Conflict | Academic & Science |
| Indirect Self-Control | Academic & Science |
| Integrated Science Curriculum | Academic & Science |
| Integrated Science Course | Academic & Science |
| Intermediate In Science | Academic & Science |
| International Society of Chemotherapy | Academic & Science |
| International Society of Chemotherapy: Infection and Cancer | Academic & Science |
| International Student Center | Academic & Science |
| Short-Circuit Current | Academic & Science |
| Icaew Student Council | Accounts and Finance |
| Isles of Scilly | Airport Code |
| Itchenor Sailing Club | Associations & Organizations |
| Indian Solidarity Council | Associations & Organizations |
| International Sports Clothing | Business |
| Investment for Social Contribution | Business |
| Interactive Space Control | Business |
| Idle Speed Controller | Business |
| Independent Speaker Chambers | Business |
| Information Security Company | Business |
| International Skychase Corporation | Business |
| Industrial Scale Company | Business |
| Innerspace Systems Corp | Business |
| International Sound Corporation | Business |
| Invention Submission Corporation | Business |
| Importers Service Corporation | Business |
| Intermediat Service Charge | Business |
| Indian School Certificate | Business |
| Interconnect Solutions Company | Business |
| Integrated Supply Chain | Business |
| International Service Center | Business |
| Intermodal Service Charge | Business |
| International Systems Consultancy | Business |
| International Strategic Consulting | Business |
| Iron Sulfur Cluster | Chemistry |
| International Service Corps | Community |
| International School of Choueifat | Community |
| international schools in China | Community |
| International Scientific Committee | Community |
| Intervention in School and Clinic | Community |
| International Security Conference | Community |
| International Stroke Conference | Community |
| Information Security Conference | Community |
| International Shelby Conference | Community |
| International Supercomputing Conference | Community |
| International sedimentological conference | Community |
| International Supercomputer Conference | Community |
| Internet Scrabble Club | Community |
| Iowa Soccer Club | Community |
| Interagency Security Committee | Community |
| International Students Committee | Community |
| International Softswitch Consortium | Computer and Networking |
| International Switching Center | Computer and Networking |
| Ignore System Crash | Computer Assembly Language |
| Interface Select Code | Computer Assembly Language |
| It Security Certifications | Computing |
| India Study Channel | Computing |
| Intel Server Control | Computing |
| Instruction Set Computer | Computing |
| International Super computing | Computing |
| Interconnect Standard Consortium | Computing |
| Interactive System Control | Computing |
| Implementation Specific Class | Computing |
| Inter Systems Communication | Computing |
| Internet Security Camera | Computing |
| Intergraph Solution Center | Computing |
| Inter System Channel | Computing |
| Input Sequence Checkers | Computing |
| Installation Support Center | Computing |
| Ip Service Control | Computing |
| Inter System Coupling | Computing |
| Interface Switching Capability | Computing |
| Information Security Certifications | Computing |
| Internet Safety Campaign | Computing |
| Internet Super Carrier | Computing |
| Internet Society of China | Computing |
| International Seismological Center | Earth Science |
| Indian Sub-continent | Earth Science |
| Inter System Crossing | Electronics |
| Industry Steering Council | Electronics |
| Intercollegiate Singles Championships | General |
| Industrial Storage Container | General |
| Industrial Specialty Chemicals | General |
| In Situ Combustion | General |
| Intermittent Self Catheterisation | General |
| Integrated Specialty Coverages | General |
| Industrial Supply Co | General |
| Information Systems in Context | General |
| Information Service Center | General |
| Imaging Supplies Coalition | General |
| Idle Speed Control | General |
| Innovative Solutions Consortium | General |
| Intelligent Suspension Control | General |
| Internet System Consortium | General |
| International Speedway Corporation | General |
| Imsa Sportscar Championship | General |
| Italia Superturismo Championship | General |
| in Service Conformity Testing | General |
| Interactive Surface Console | General |
| Intelligent Speed Control | General |
| Inter Stage Cooler | General |
| Idle Speed Compensator | General |
| Indonesian Starlet Club | General |
| Isuzu Social Club | General |
| Isuzu Service Centre | General |
| Interface for Siebel Communications | General |
| Industrial Source Complex | General |
| International Skydiving Commission | General |
| Integrated Signal Conditioner | General |
| In System Configuration | General |
| Infinite Sales Cycle | General |
| International Sorting Center | General |
| Innovative Solutions in the Cloud | General |
| International Student Centre | General |
| International SEO Companies | General |
| Industrial Standards of Cambodia | General |
| Industrial Supply Chain | General |
| Intensive Study Course | General |
| Individual Social Code | General |
| Integrated Service Center | General |
| Integrated Service Centre | General |
| IMS Service Control | General |
| Internal Service Charge | General |
| Inter Service Consultation | General |
| I Stand Corrected | General |
| Inter Subject Correlation | General |
| Image Source Control | General |
| Imperial Stellar Corps | General |
| Inactive Shards Chance | General |
| Invasive Species Compendium | General |
| Independent Shakespeare Co | General |
| International Speech Contest | General |
| International Speedway | General |
| International Sculpture Center | General |
| International Supreme Council | Governmental |
| Idaho Supreme Court | Governmental |
| Inter-State Council | Governmental |
| Inter-Software Communications | Governmental |
| Interstate Stream Commission | Governmental |
| Intelligence Specialist Chief Petty Officer | Governmental |
| International Standards Committee | Governmental |
| Independent Schools Council | Governmental |
| International Science Council | Governmental |
| International Stevia Council | Governmental |
| Inter Sector Coordinator | Governmental |
| Instituto de Salud Carlos | Governmental |
| Immigration Skills Charge | Governmental |
| Institute for Sustainable Communities | Governmental |
| Institute for Strategy and Competitiveness | Governmental |
| Internet Storm Center | Information Technology |
| International Signal and Control | International |
| International Student Cebab | International |
| International Spirits Challenge | International |
| INTERNATIONAL Students Congress | International |
| International Softball Congress | International |
| International Society for Criminology | International |
| International Society of Cryptozoology | International |
| International Service Centre | International |
| Indonesian Soccer Championship | International |
| International Study Centre | International |
| International Student Convention | International |
| International Seismological Centre | International |
| International School Consultancy | International |
| International Snowmobile Congress | International |
| Internet Systems Consortium | Internet |
| Internet Slang Chat | Internet |
| Independent Search Consultant | Jobs |
| International Society of Cardiology | Medical |
| Intermittent Self-Catheterization | Medical |
| Information Systems Command | Military and Defence |
| Integrated System Control | Military and Defence |
| Inter-software Commo | Military and Defence |
| Interservice Separation Codes | Military and Defence |
| Integrated Support Command | Military and Defence |
| Integrated Strategic Communication | Military and Defence |
| Intermediate Service Center | Military and Defence |
| Information Systems Center | Military and Defence |
| The International Softswitch Consortium | Networking |
| St, Marys, Isles Of Scilly, England, UK | Regional |
| Internet Software Consortium | Softwares |
| Interstellar Space Craft | Space Science |
| Individual Scrum Championship | Sports |
| Irish Sports Council | Sports |
| Interactive Strength Challenger | Sports |
| Infrastructure Service Charge | Telecommunication |
| St Mary’s Airport | Transport & Travel |
