Delete A SharePoint Online/O365 Site Using PowerShell And CSOM

Steps

Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
$siteUrl = “https://gowtham.sharepoint.com/tutorials/sitecollections/test1”
$username = "[email protected]"
$password = ""
$ctx = New-Object Microsoft.SharePoint.Client.ClientContext($siteUrl)
$credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($username, $password)
$ctx.Credentials = $credentials
$web = $ctx.Web
$ctx.Load($web)
$ctx.ExecuteQuery()
$web.DeleteObject()
$ctx.ExecuteQuery()
Write-Host $web.Title "Site collection has been deleted"