diff --git a/Modules/CIPPCore/Public/Standards/Invoke-CIPPStandardUserPreferredLanguage.ps1 b/Modules/CIPPCore/Public/Standards/Invoke-CIPPStandardUserPreferredLanguage.ps1
new file mode 100644
index 000000000000..77784c0524bb
--- /dev/null
+++ b/Modules/CIPPCore/Public/Standards/Invoke-CIPPStandardUserPreferredLanguage.ps1
@@ -0,0 +1,71 @@
+function Invoke-CIPPStandardUserPreferredLanguage {
+    <#
+    .FUNCTIONALITY
+        Internal
+    .COMPONENT
+        (APIName) UserPreferredLanguage
+    .SYNOPSIS
+        (Label) Preferred language for all users
+    .DESCRIPTION
+        (Helptext) Sets the preferred language property for all users in the tenant. This will override the user's language settings.
+        (DocsDescription) Sets the preferred language property for all users in the tenant. This will override the user's language settings.
+    .NOTES
+        CAT
+            Entra (AAD) Standards
+        TAG
+        ADDEDCOMPONENT
+            {"type":"autoComplete","multiple":false,"creatable":false,"name":"standards.UserPreferredLanguage.preferredLanguage","label":"Preferred Language","api":{"url":"/languageList.json","labelField":"language","valueField":"tag"}}
+        IMPACT
+            High Impact
+        ADDEDDATE
+            2025-02-26
+        POWERSHELLEQUIVALENT
+            Update-MgUser -UserId user@domain.com -BodyParameter @{preferredLanguage='en-US'}
+        RECOMMENDEDBY
+        UPDATECOMMENTBLOCK
+            Run the Tools\Update-StandardsComments.ps1 script to update this comment block
+    .LINK
+        https://docs.cipp.app/user-documentation/tenant/standards/list-standards/entra-aad-standards#high-impact
+    #>
+
+    param($Tenant, $Settings)
+
+    $preferredLanguage = $Settings.preferredLanguage.value
+    $IncorrectUsers = New-GraphGetRequest -uri "https://graph.microsoft.com/beta/users?`$top=999&`$select=userPrincipalName,displayName,preferredLanguage,userType,onPremisesSyncEnabled&`$filter=preferredLanguage ne '$preferredLanguage' and userType eq 'Member' and onPremisesSyncEnabled ne true&`$count=true&ConsistencyLevel=eventual" -tenantid $Tenant
+
+    If ($Settings.remediate -eq $true) {
+        if (($IncorrectUsers | Measure-Object).Count -gt 0) {
+            try {
+                ForEach ($user in $IncorrectUsers) {
+                    $cmdparams = @{
+                        tenantid    = $Tenant
+                        uri         = "https://graph.microsoft.com/beta/users/$($user.userPrincipalName)"
+                        AsApp       = $true
+                        Type        = 'PATCH'
+                        Body        = @{
+                            preferredLanguage = $preferredLanguage
+                        } | ConvertTo-Json
+                        ContentType = 'application/json; charset=utf-8'
+                    }
+                    $null = New-GraphPOSTRequest @cmdparams
+                    Write-LogMessage -API 'Standards' -tenant $tenant -message "Preferred language for $($user.userPrincipalName) has been set to $preferredLanguage" -sev Info
+                }
+            } catch {
+                $ErrorMessage = Get-NormalizedError -Message $_.Exception.Message
+                Write-LogMessage -API 'Standards' -tenant $tenant -message "Failed to set preferred language to $preferredLanguage for all users." -sev Error -LogData $ErrorMessage
+            }
+        }
+    }
+
+    If ($Settings.alert -eq $true) {
+        if (($IncorrectUsers.userPrincipalName | Measure-Object).Count -gt 0) {
+            Write-LogMessage -API 'Standards' -tenant $tenant -message "The following accounts do not have the preferred language set to $preferredLanguage : $($IncorrectUsers.userPrincipalName -join ', ')" -sev Alert
+        } else {
+            Write-LogMessage -API 'Standards' -tenant $tenant -message 'No accounts do not have the preferred language set to the preferred language' -sev Info
+        }
+    }
+
+    if ($Settings.report -eq $true) {
+        Add-CIPPBPAField -FieldName 'IncorrectUsers' -FieldValue $IncorrectUsers -StoreAs json -Tenant $tenant
+    }
+}