--- question: "What is the difference between ISO 27001 and NIST 800-53?" title: "What Is the Difference Between ISO 27001 and NIST 800-53" seoTitle: "ISO 27001 vs NIST 800-53: Differences and Mapping" summary: "ISO 27001 is an international, certifiable standard for an information security management system: it requires a risk-driven management process and lists 93 reference controls in Annex A, grouped into four themes. NIST SP 800-53 is a US government catalog of roughly 1,000 security and privacy controls and enhancements in 20 families, with low, moderate, and high baselines; it is mandatory for federal systems and there is no certification against it. ISO 27001 defines how to run a security program and is proven with a certificate, while NIST 800-53 specifies controls in far more detail. The two map to each other, and NIST publishes the official crosswalk." publishedAt: "2026-09-14" keywords: - "ISO 27001 vs NIST 800-53" - "difference between ISO 27001 and NIST 800-53" - "4 categories of ISO 27001" - "NIST 800-53 to ISO 27001 mapping" pillar: "Beyond SOC 2" faqs: - question: "what are the 4 categories of iso 27001?" answer: "ISO 27001:2022 groups its 93 Annex A controls into four themes: organizational controls (37), people controls (8), physical controls (14), and technological controls (34). The 2013 version used 14 domains and 114 controls; the four themes replaced them in the 2022 revision." - question: "Can you get certified in NIST 800-53?" answer: "No. There is no certification against NIST SP 800-53 itself. Federal systems receive an authorization to operate after assessment against an 800-53 baseline, and cloud providers selling to the US government go through FedRAMP, which is built on 800-53. Commercial companies can be assessed against it, but the result is an assessment report, not a certificate." - question: "Should a startup use ISO 27001 or NIST 800-53?" answer: "A commercial startup should pursue ISO 27001 or SOC 2 if customers ask for them, since both produce a report or certificate buyers recognize. NIST 800-53 is worth adopting only if you sell to US federal agencies, or as an internal reference catalog, where its detail helps map several frameworks to one control set." --- ## What is the difference between ISO 27001 and NIST 800-53? **ISO 27001 is a certifiable standard for running a security management system, and NIST 800-53 is a detailed catalog of controls with no certification.** ISO 27001 requires a risk-driven process for running information security and lists 93 reference controls in Annex A, and an accredited certification body can certify you against it. NIST SP 800-53 lists roughly 1,000 controls and enhancements across 20 families, is mandatory for US federal systems, and is used by commercial companies mainly as a reference. ## ISO 27001 and NIST 800-53 side by side | | ISO 27001:2022 | NIST SP 800-53 Rev. 5 | |---|---|---| | Publisher | ISO and IEC, international standards bodies | US National Institute of Standards and Technology | | Type | Management system standard with reference controls | Control catalog | | Size | 93 Annex A controls in 4 themes | Roughly 1,000 controls and enhancements in 20 families | | How controls are chosen | Risk assessment, justified in a Statement of Applicability | Low, moderate, or high baseline, then tailoring | | Certification | Yes, by an accredited certification body, valid three years with annual surveillance audits | No; federal systems receive an authorization to operate | | Who requires it | International and enterprise buyers | US federal agencies and their contractors, and FedRAMP | | Cost of use | The standard must be purchased | Free to download | ## How the structure differs ISO 27001's core is its management clauses, 4 through 10: define scope, assess risk, set objectives, operate controls, measure, audit internally, review, and improve. Annex A is a checklist of controls to consider, and you may exclude controls that do not apply as long as the Statement of Applicability says why. A certification auditor tests the management system as much as the controls. NIST 800-53 starts from the controls. Each control has a statement, discussion, and optional enhancements, and the baselines in SP 800-53B select which ones a system of a given impact level must implement. A single 800-53 control such as AC-2, Account Management, carries more than a dozen enhancements, where ISO 27001 covers the same ground in a few Annex A controls. That detail is why 800-53 is often used as a reference catalog even by organizations that never need it. ## How they map to each other NIST publishes an official mapping between SP 800-53 and ISO 27001, so the two are routinely used together. The mapping is many-to-many: one Annex A control usually corresponds to several 800-53 controls, because 800-53 splits each topic more finely. That granularity is what makes 800-53 useful as a hub. When a company holds SOC 2 and adds ISO 27001 or HIPAA, mapping each framework to one detailed catalog lets a single control test serve all of them, instead of maintaining three overlapping control lists. Screenata uses NIST 800-53 as the hub for SOC 2, ISO 27001, and HIPAA for exactly this reason. For more on the catalog itself, see [what NIST 800-53 is](/resources/answers/what-is-nist-800-53).