A Deputy CISO, or Deputy Chief Information Security Officer, is a senior security leader who supports the CISO in directing an organization’s security program. Depending on the organization, the role may include coordinating security operations, overseeing teams, managing risk, and helping implement policies and controls. Responsibilities vary, and the deputy may act on the CISO’s behalf when needed.
The role matters because it connects security strategy with day-to-day defense. A Deputy CISO may help coordinate responses to threats, align security work across departments, and ensure protective measures are maintained as business needs change. In an attack, the deputy might support incident coordination and leadership decisions; in routine operations, they may oversee monitoring, risk management, or preparedness. The title alone does not establish specific authority or duties, which depend on the organization.