You can delete a team in Teams from the desktop or web app. If you’re the team owner, go to the team's name and select More options
> Delete team
. Your team will be permanently removed.
Tip: To see all of the teams you own, select More list options
>Your teams and channels
then select Teams you own.
Remember:
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Deleting a team removes the team mailbox and calendar from Exchange
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The corresponding SharePoint site and all its files will also be deleted
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And any OneNote notebook, Planner plan, PowerBI workspace, or Stream group affiliated with the team will also be deleted