Delete a channel in Microsoft Teams
Team owners get to decide which team members can delete and restore channels.
Tip: If you’re considering deleting a channel because you’re being inundated by notifications about new messages, you can instead just turn off notifications.
To delete a channel and all associated conversation history, go to the channel name and click More options 
The OneNote sections associated with a deleted channel will still show up on your team's SharePoint site.
To restore a channel that was previously deleted, along with all the conversations and content:
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Go to the team that the channel was in and click More options
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Select the Channels tab at the top of the view.
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Scroll down to Deleted and expand the list of channels.
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Select Restore next to the channel you want to restore.
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On the confirmation screen, select Restore.
Channels can be restored within 21 days of deletion, but no new channels can be created with the same name as the deleted channel within that 21-day window.
Related Topics
Go to the desktop or web app to delete a channel.
Tap Teams 
Note: Team owners get to decide which team members can delete and restore channels.
The OneNote sections associated with a deleted channel will still show up on your team's SharePoint site.
Channels can be restored within 21 days of deletion, but no new channels can be created with the same name as the deleted channel within that 21-day window.
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