Tip: Only organization owners can delete parent teams. For more information, see "About teams."
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In the upper-right corner of GitHub Enterprise Server, select your profile photo, then click Your organizations.  
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Click the name of 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, select the X teams selected dropdown menu and click Delete.  
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Review the team or teams that will be deleted, then click I understand, delete teams.