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In the upper-right corner of GitHub, click your profile picture, then click 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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Click the name of the team. 
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At the top of the team page, click Settings.  
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In the "Team name" field, type a new name for the team. 
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Optionally, in the "Description" field, type a new description of the team. 
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Click Update. 
Renaming a team
Team maintainers and organization owners can edit the name and description of a team.