SharePoint Online: Remove a Content Type from All Lists in a Site Collection using PowerShell

Requirement: Remove Content Type from All Lists and Libraries in a SharePoint Online Site Collection

PowerShell to Remove Content Type from All Lists and Libraries in a Site Collection
This PowerShell script iterates through all lists and libraries of a given site collections, scans for provided content type and removes it, if its not being used!

#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
 
#Function to remove content type from a site collection
Function Remove-SPOContentType([String]$SiteURL, [String]$ContentTypeName)
{
    Try{
        Write-host -f Yellow "Processing Site:" $SiteURL
 
        #Setup the context
        $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
        $Ctx.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)
     
        #Get All Lists of the Web
        $Ctx.Load($Ctx.Web)
        $Ctx.Load($Ctx.Web.Lists)
        $Ctx.Load($ctx.Web.Webs)
        $Ctx.ExecuteQuery()
 
        #Get content types of each list from the web
        ForEach($List in $Ctx.Web.Lists)
        {
            $ContentTypes = $List.ContentTypes
            $Ctx.Load($ContentTypes)
            $Ctx.ExecuteQuery()             

            #Get each content type data
            ForEach($CType in $ContentTypes)
            {
                If($CType.Name -eq $ContentTypeName)
                {
                    Try{
                        #Remove Content Type from List
                        $CType.DeleteObject()
                        $Ctx.ExecuteQuery()
                        Write-host -f Green "Removed Content Type from List/Library:" $List.Title
                        }
                    Catch {
                    write-host -f Red "`tError Removing Content Type from '$($List.Title)' :" $_.Exception.Message
                    }
                }
            }
        }
 
         #Iterate through each subsite of the current web and call the function recursively
        foreach ($Subweb in $Ctx.web.Webs)
        {
            #Call the function recursively to process all subsites underneaththe current web
            Remove-SPOContentType $Subweb.url $ContentTypeName
        }
    }
    Catch {
    write-host -f Red "Error Removing Content Type:" $_.Exception.Message
    }
}
 
#Config Parameters
$SiteURL="https://crescent.sharepoint.com/sites/marketing"
$ContentTypeName="Project Proposal"
 
#Get Credentials to connect
$Cred= Get-Credential
 
#Call the function to get the content type usage
Remove-SPOContentType -SiteURL $SiteURL -ContentTypeName $ContentTypeName

Related posts:

• SharePoint Online: Remove Content Type From List using PowerShell
• SharePoint Online: Find Content Type usage in a Site Collection using PowerShell