Tip: Only organization owners can delete parent teams. For more information, see "About teams."
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In the top right corner of GitHub Enterprise Server, click your profile photo, then click Your profile.  
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On the left side of your profile page, under "Organizations", click the icon for your organization.  
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Under your organization name, click Teams.  
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Select the team or teams you'd like to delete.  
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Above the list of teams, use the drop-down menu and click Delete.  
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Review the team or teams that will be deleted, then click I understand, delete teams. 