| FIRST | Factors In Risk Selection Techniques 
| Others |
| FIRST | Faculty Institute to Reform Science Teaching
| Others |
| FIRST | Fair and Immediate Resources for Students Today
| Others |
| FIRST | Families In Recovery to Stay Together
| Others |
| FIRST | Far-InfraRed Space Telescope
| Others |
| FIRST | Farmer's Independent Research of Seed Technologies
| Others |
| FIRST | Fast and Immediate Rescue Service Team
| Others |
| FIRST | Fast Intensive Report Supervision and Treatment
| Others |
| FIRST | Fax Information Retrieval Support Technology
| Others |
| FIRSt | FDA Information Retrieval System
| Others |
| FIRST | Feedstock Impregnation and Rapid Steam Treatment
| Others |
| FIRST | Ferrets Information Rescue Shelter Trust
| Others |
| FIRST | Fighting Irish Retired Service Team
| Others |
| FIRST | Financial Information Resources, Services, and Tools
| Others |
| FIRST | Financial Integrity Rating System of Texas
| Others |
| FIRST | Finding Innovative Revenue Streams Today
| Others |
| FIRST | Firearm Instruction and Responsibility Safety Training
| Others |
| FIRST | Firearm Instruction Responsibility and Safety Training
| Others |
| FIRST | Firearm Instruction Responsibility Safety Training
| Others |
| FIRST | First In Recognition of Science and Technology
| Others |
| FIRST | First Inspiration and Recognition of Science and Technology
| Others |
| FIRST | Fixed Interest Rate Savings Tax
| Others |
| FIRST | Flexible Instruction Reference and Support Tool
| Others |
| FIRST | Flexographic Image Reproduction Specifications Tolerances
| Others |
| FIRST | Floppy Inclusions and Rigid Substructure Topography
| Others |
| FIRST | Floriculture Industry Research Scholarship Trust
| Others |
| FIRST | For Inspiration and Recognition in Science and Technology
| Others |
| FIRST | For Inspiration and Recognition of Science and Technology
| Others |
| FIRST | For Inspiration Recognition of Science Technology
| Others |
| FIRST | Forum for Incident Response and Security Teams
| Others |
| FIRST | Forum for Independents and Republicans of Schaumburg Township
| Others |
| FIRST | Forum of Incident Response and Security Teams
| Others |
| FIRST | Foundation for Ichthyosis & Related Skin Types
| Others |
| FIRST | Foundation for Individual Responsibility and Social Trust
| Others |
| FIRST | Foundation for Innovation Regional Services and Telecommunications
| Others |
| FIRST | Foundation for Inspiration and Recognition of Science and Technology
| Others |
| FIRST | Fraunhofer Institute Computer Architecture and Software Technology
| Others |
| FIRST | Freshman Incorporating Respect Service and Teamwork
| Others |
| FIRST | Friendly Information Referral Service Team
| Others |
| FIRST | Friendly Innovative Reliable Sincere Team
| Others |
| FIRST | Frontiers In Research Space and Time
| Others |
| FIRST | Fuel Injection Research Systems Technology
| Others |
| FIRST | Fully Integrated Road Safety Technology
| Others |
| FIRST | Furthering Information Research, Support, and Training
| Others |