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In the top right corner of GitHub.com, click 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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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.