Browse 10 of the largest U.S. federal contracting agencies on SAM.gov. Pick a department to see active RFPs, NAICS codes, set-asides, and AI proposal drafts in minutes.
Generate a Proposal — FreeLargest federal contracting agency — typically $400B+ in annual obligations spanning the Army, Navy, Air Force, Marine Corps, Space Force, and the Fourth Estate.
View DoD opportunities →Major civilian federal buyer with award volume concentrated at CBP, ICE, FEMA, TSA, and CISA.
View DHS opportunities →Runs the federal government’s central procurement vehicles (MAS, OASIS+, VETS-2, 8(a) STARS III) and the federal building portfolio.
View GSA opportunities →Second-largest federal department by spend after DoD; runs the Veterans First Contracting Program (VOSB / SDVOSB set-asides).
View VA opportunities →Smaller dollar-share than DoD, but mission-driven awards run across ten field centers and tend to favor long-term contractor relationships through FFRDCs.
View NASA opportunities →Awards concentrate at NIH, CDC, CMS, and FDA — all major buyers of federal health services and biomedical research.
View HHS opportunities →National laboratory operating contracts run in the hundreds of millions annually; R&D and environmental remediation awards across 17 labs.
View DoE opportunities →Awards spread across the Bureau of Administration, Consular Affairs, and Diplomatic Security — with meaningful small-business set-aside action.
View DoS opportunities →Mid-sized civilian federal buyer with strong set-aside action across the Forest Service, Rural Development, and Food and Nutrition Service.
View USDA opportunities →Smaller share than the Big 4 (DoD, DHS, GSA, VA) but meaningful set-aside action across FBI, BOP, USMS, and OJP.
View DOJ opportunities →