| FAA | Federal Aviation Administration |
| FAADS | Federal Assistance Award Data System |
| FAMWEB | Fire and Aviation Management Web Applications |
| Fannie Mae | Federal National Mortgage Association |
| FAO | Food and Agriculture Organization |
| FAPRS | Federal Assistance Programs Retrieval System (replaced by CFDA) |
| FAR | Federal Acquisition Regulation |
| Farmer Mac | Federal Agricultural Mortgage Corporation |
| FAS | Federal Acquisition Service | Foreign Agricultural Service |
| FASAB | Federal Accounting Standards Advisory Board |
| FAVIR | Fruits and Vegetables Import Requirements Database |
| FBCI | Faith-Based and Community Initiatives |
| FBI | Federal Bureau of Investigation |
| FBIS | Foreign Broadcast Information Service (changed to WNC) |
| FBO | Federal Business Opportunities |
| FCA | Farm Credit Administration |
| FCC | Federal Communications Commission |
| FCG | Federal Consulting Group |
| FCIC | Federal Consumer Information Center | Federal Crop Insurance Corporation |
| FCSC | Foreign Claims Settlement Commission |
| FCSIC | Farm Credit System Insurance Corporation |
| FD | Food Distribution Programs |
| FDA | Food and Drug Administration |
| FDA-TRACK | FDA Transparency-Results-Accountability-Credibility-Knowledge Sharing |
| FDIC | Federal Deposit Insurance Corporation |
| FDLP | Federal Depository Library Program |
| FDPIR | Food Distribution Program on Indian Reservations |
| FDsys | (GPO) Federal Digital System |
| FE | Office of Fossil Energy |
| FEB | Federal Executive Boards |
| FEC | Federal Election Commission |
| FEDIX | Federal Information Exchange Inc. (defunct) |
| FedRAMP | Federal Risk and Authorization Management Program |
| FedRelay | Federal Relay Service |
| FEDRIP | Federal Research in Progress Database |
| FEDSTATS | Federal Interagency Council on Statistical Policy |
| FEMA | Federal Emergency Management Agency |
| FEMP | Federal Energy Management Program |
| FERA | Fate, Exposure, and Risk Analysis |
| FERC | Federal Energy Regulatory Commission |
| Fermilab | Fermi National Accelerator Laboratory |
| FETC | Federal Energy Technology Center (changed to NETL) |
| FFAS | Farm & Foreign Agricultural Service |
| FFB | Federal Financing Bank |
| FFIEC | Federal Financial Institutions Examination Council |
| FGDC | Federal Geographic Data Committee |
| FHA | Federal Housing Administration |
| FHC | Fisheries and Habitat Conservation |
| FHEO | Fair Housing and Equal Opportunity |
| FHFA | Federal Housing Finance Agency |
| FHFB | Federal Housing Finance Board (merged into FHFA) |
| FHWA | Federal Highway Administration |
| FIA | Federal Insurance Administration | Forest Inventory and Analysis |
| FIC | John E. Fogarty International Center for Advanced Study in the Health Sciences |
| FICMNEW | Federal Interagency Committee for the Management of Noxious and Exotic Weeds |
| FICO | Financing Corporation |
| FIDO | Federal Interagency Databases Online |
| FINCEN | Financial Crimes Enforcement Network |
| FIPS | Federal Information Processing Standard |
| FISA | Federal Intelligence Surveillance Court |
| FJC | Federal Judicial Center |
| FLC | Federal Laboratory Consortium |
| FLETC | Federal Law Enforcement Training Center |
| FLH | Office of Federal Lands Highway |
| FLICC | Federal Library and Information Center Committee |
| FLRA | Federal Labor Relations Authority |
| FMAP | Federal Medical Assistance Percentage |
| FMC | Federal Maritime Commission |
| FMCS | Federal Mediation and Conciliation Service |
| FMCSA | Federal Motor Carrier Safety Administration |
| FMLA | Family and Medical Leave Act |
| FMNP | Farmers Market Nutrition Program |
| FMS | Financial Management Service |
| FMSHRC | Federal Mine Safety and Health Review Commission |
| FNCS | Food, Nutrition, and Consumer Services |
| FNIC | Food and Nutrition Information Center |
| FNMA | Federal National Mortgage Association |
| FNS | Food and Nutrition Service |
| FOIA | Freedom of Information Act |
| FOMC | Federal Open Market Committee |
| FOUO | For Official Use Only (.pdf) |
| FPCO | Family Policy Compliance Office |
| FPDC | Federal Procurement Data Center |
| FPDS | Federal Procurement Data System |
| FPIC | Federal Partnership for Interoperable Communications |
| FPKIPA | Federal Public Key Infrastructure Policy Authority |
| FPKISC | Federal Public Key Infrastructure Steering Committee (changed to FPKIPA) |
| FPS | Federal Protective Service |
| FR | Federal Register |
| FRA | Federal Railroad Administration |
| FRB | Federal Reserve Board |
| FRD | Federal Research Division |
| Freddie Mac | Federal Home Loan Corporation |
| FREE | Federal Resources for Educational Excellence |
| FreedomCAR | Freedom Cooperative Automotive Research and Vehicle Technologies Program |
| FRS | Federal Reserve System | Federal Relay Service (changed to FedRelay) |
| FRTIB | Federal Retirement Thrift Investment Board |
| FRTR | Federal Remediation Technologies Roundtable |
| FS | Forest Service |
| FSA | Farm Service Agency | Office of Federal Student Aid |
| FSDO | Flight Standards District Offices |
| FSI | Foreign Service Institute |
| FSIC | Food Safety Information Center |
| FSIS | Food Safety and Inspection Service |
| FSP | Food Stamp Program (changed to SNAP) |
| FSS | Federal Supply Service |
| FTA | Federal Transit Administration |
| FTC | Federal Trade Commission |
| FTS | Federal Technology Service (merged into FAS) |
| FTZ | Foreign-Trade Zones Board |
| FUDS | Formerly Used Defense Sites |
| FWS | Fish and Wildlife Service |
| FYSB | Family and Youth Services Bureau |
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