CO / KO
Contracting Officer
Procurement ConceptsDefinition
A Contracting Officer (CO, sometimes abbreviated KO) is the only government official authorized to enter into, modify, or terminate a federal contract. No other government employee can bind the government to a contractual obligation — only the CO has that legal authority.
This distinction matters more than most contractors realize. If a program manager, technical evaluator, or other government employee tells you to change scope or promises additional funding, it has no contractual weight unless confirmed by the CO in writing. Acting on unauthorized direction can leave you performing work you'll never be paid for.
COs are supported by Contract Specialists (who handle administrative tasks) and Contracting Officer Representatives (CORs) who monitor technical performance. But only the CO signs contracts and modifications.
Building a relationship with your CO is essential. They control your payment terms, approve modifications, and can exercise option years or terminate for convenience. Treat them as a key stakeholder in your contract performance.
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