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In the upper-right corner of any page, click your profile photo, then click Settings.

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In the left sidebar, click Developer settings.
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In the left sidebar, click GitHub Apps.

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Select the GitHub App you want to delete.

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In the left sidebar, click Advanced.

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Click Delete GitHub App.

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Type the name of the GitHub App to confirm you want to delete it.

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Click I understand the consequences, delete this GitHub App.

Deleting a GitHub App
You can delete GitHub Apps when you no longer use them.