| Acronym | Definition |
|---|
| FBI | Federal Bureau of Investigation (US government) |
| FBI | Forbrukerinspektørene |
| FBI | First Baltic International |
| FBI | Fiscale Beleggingsinstelling (Dutch: Fiscal Investment Institution) |
| FBI | Federation of British Industries |
| FBI | Frontier Booking International (Hollywood, CA, USA) |
| FBI | Female Body Inspectors (gaming group) |
| FBI | Flowers By Irene (Simpsons) |
| FBI | Fee-Based Income |
| FBI | Foreign Born Irish |
| FBI | Food & Beverage Institute (Culinary Institute of America) |
| FBI | Full Blooded Irish |
| FBI | File by Internet (taxation; UK) |
| FBI | File Based Installer |
| FBI | Full Blooded Ilocano (Philippines from Big Island of Hawai'i) |
| FBI | Firm Believer in Islam |
| FBI | Fiji Born Indian |
| FBI | France Britain Ireland (band in Swords, Co. Dublin, Ireland) |
| FBI | Force by Intelligence (gaming clan) |
| FBI | Foliar Browse Index |
| FBI | Fungi, Bacteria, and Invertebrate |
| FBI | Funny Business Incorporated (Danish website) |
| FBI | Frank's Breakfast Inn (fictional, Adventures In Odyssey) |
| FBI | Fungi, Bacteria and Insects |
| FBI | Future Business Intercommunications Limited |
| FBI | Funny, Beautiful, Intelligent |
| FBI | Federal Building Industries Company LLC (Dubai, UAE) |
| FBI | Fubu Bodywear Incorporated |
| FBI | File Based Inserting |
| FBI | Flyen Boyz, Inc. (automobile club; New Zealand) |
| FBI | Faith Based Initiatives |
| FBI | Firm Believer in Christ |
| FBI | Ferrous Basic Integral (coating thickness gages on steel, ferrous substrates) |
| FBI | Feedback Inhibition |
| FBI | Fenerbahce Incorporated (football team in Turkey) |
| FBI | Full Blooded Indian |
| FBI | Full Blooded Italian |
| FBI | Force, Magnetic (B field), Current (I) |
| FBI | Famous But Incompetent (common slang used by militia groups) |
| FBI | Farm Bureau Insurance |
| FBI | Forbidden Planet International |
| FBI | From Big Island (Hawaii) |
| FBI | Fidelity, Bravery, Integrity (motto, Federal Bureau of Investigation) |
| FBI | Fluidized Bed Incinerator |
| FBI | Food Borne Illness |
| FBI | Full Blooded Italians (pro wrestling) |
| FBI | Feedback Information (3GPP) |
| FBI | Fachbereich Informatik (German: department for computer science) |
| FBI | Finance, Banking and Insurance |
| FBI | Family-Based Intervention |
| FBI | Fairytale Believers Incorporated |