Only members with owner privileges for an organization or admin privileges for a repository can delete an organization repository, and these users may be prevented from deleting a repository by an organization or enterprise policy. For more information, see Repository roles for an organization.
Deleting a public repository will not delete any forks of the repository.
Warning
- Deleting a repository will permanently delete release attachments and team permissions. This action cannot be undone.
- Deleting a private or internal repository will delete all forks of the repository.
Some deleted repositories can be restored within 90 days of deletion. Your site administrator may be able to restore a deleted repository for you. For more information, see Restoring a deleted repository.
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On GitHub, navigate to the main page of the repository. 
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Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.  
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On the "General" settings page (which is selected by default), scroll down to the "Danger Zone" section and click Delete this repository. 
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Click I want to delete this repository. 
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Read the warnings and click I have read and understand these effects. 
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To verify that you're deleting the correct repository, in the text box, type the name of the repository you want to delete. 
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Click Delete this repository.