For Official Use Only (FOUO) is an information security designation, used by several jurisdictions.
For Official Use Only is primarily used by the United States Department of Defence as a handling instruction for Sensitive but Unclassified information that is exempt from release under the Freedom of Information Act. It is one of the various categories which is due to be consolidated within the category Controlled Unclassified Information.
For Official Use Only is one of the five categories of Dissemination Limiting Marker (DLM) defined by the Australian Government Information Security Management Guidelines. The guidelines state that FOUO should only be used on unclassified information, when its compromise may cause limited damage to national security, Australian Government agencies, commercial entities or members of the public. However unlike the United States usage, the presence or absence of an FOUO marker expressly does not provide any information about the document's status under the Freedom of Information Act.