You can prevent users from creating organizations on your GitHub Enterprise appliance.
As a site admin, sign in to your GitHub Enterprise instance at
http(s)://[hostname]/login
.In the upper-right corner of any page, click .
On the left side of the page, click Advanced Settings.
Under Add a new setting, type
disable_user_org_creation
as a key andtrue
as its value (leaving Default selected).Click Add.
You should now see the new setting listed:
Users (everyone except site administrators) will no longer be able to create organizations: