ISO 27001 is an Information Security Management System (ISMS) standard published in October 2005 by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC).

ISO 27001 formally specifies a management system that is intended to bring information security under explicit management control. Being a formal specification means that it mandates specific requirements. Organizations that claim to have adopted ISO 27001 can therefore be formally audited and certified compliant with the standard.

ISO 27001 requires that management

• Systematically examine the organization's information security risks, taking account of the threats, vulnerabilities and impacts;
• Design and implement a coherent and comprehensive suite of information security controls and/or other forms of risk treatment (such as risk avoidance or risk transfer) to address those risks that are deemed unacceptable; and
• Adopt an overarching management process to ensure that the information security controls continue to meet the organization's information security needs on an ongoing basis.