About deletion of your organization account
Deleting your organization account removes all repositories, forks of private repositories, wikis, issues, pull requests, and project or organization pages.
If the account namespace includes any packages or container images stored in a GitHub Packages registry, GitHub deletes the packages and container images when you delete your account. By deleting your account, you may break projects that depend on these packages and images.
Backing up your organization content
Before you delete your organization, make sure you have a copy of all repositories, wikis, issues, and project boards from the account.
Note: If necessary, a site administrator for your GitHub Enterprise Server instance may be able to partially restore a deleted organization. For more information, see "Restoring a deleted organization."
Deleting your organization account
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In the top right corner of GitHub Enterprise Server, click your profile photo, then click Your organizations.
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Next to the organization, click Settings.
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In the "Danger zone" section, click Delete this organization.
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Read the warning. If you want to proceed, type the organization's name, then click Cancel plan and delete the organization.