diff --git a/application/themehandler.class.inc.php b/application/themehandler.class.inc.php
index ebbe06ade..603bc3a2e 100644
--- a/application/themehandler.class.inc.php
+++ b/application/themehandler.class.inc.php
@@ -93,11 +93,15 @@ class ThemeHandler
 	 */
 	public static function GetCurrentUserThemeId(): string
 	{
+		$sThemeId = null;
+
 		try {
-			$sThemeId = appUserPreferences::GetPref('backoffice_theme', null);
+			if (true === MetaModel::GetConfig()->Get('user_preferences.allow_backoffice_theme_override')) {
+				$sThemeId = appUserPreferences::GetPref('backoffice_theme', null);
+			}
 		}
 		catch (Exception $oException) {
-			$sThemeId = null;
+			// Do nothing, already handled by $sThemeId null by default
 		}
 
 		// Fallback on the app. theme
diff --git a/core/config.class.inc.php b/core/config.class.inc.php
index 3b2902042..d2e3e6545 100644
--- a/core/config.class.inc.php
+++ b/core/config.class.inc.php
@@ -1287,6 +1287,14 @@ class Config
 			'source_of_value' => '',
 			'show_in_conf_sample' => false,
 		],
+		'user_preferences.allow_backoffice_theme_override' => [
+			'type' => 'bool',
+			'description' => 'Whether the user can choose which theme to use in the backoffice. If set to false, all users will have the theme defined in "backoffice_default_theme"',
+			'default' => true,
+			'value' => '',
+			'source_of_value' => '',
+			'show_in_conf_sample' => false,
+		],
 		'secure_rest_services' => [
 			'type' => 'bool',
 			'description' => 'When set to true, only the users with the profile "REST Services User" are allowed to use the REST web services.',
diff --git a/pages/preferences.php b/pages/preferences.php
index f2762bae9..c147ddd6e 100644
--- a/pages/preferences.php
+++ b/pages/preferences.php
@@ -79,7 +79,9 @@ function DisplayPreferences($oP)
 	// General
 	$oGeneralFieldset = FieldSetUIBlockFactory::MakeStandard(Dict::S('UI:Preferences:General:Title'), 'ibo-fieldset-for-language-preferences');
 	$oGeneralFieldset->AddSubBlock(GetLanguageFieldBlock());
-	$oGeneralFieldset->AddSubBlock(GetThemeFieldBlock());
+	if (true === MetaModel::GetConfig()->Get('user_preferences.allow_backoffice_theme_override')) {
+		$oGeneralFieldset->AddSubBlock(GetThemeFieldBlock());
+	}
 	$oFirstColumn->AddSubBlock($oGeneralFieldset);
 
 	// Lists