diff --git a/apps/qubit/modules/settings/actions/diacriticsAction.class.php b/apps/qubit/modules/settings/actions/diacriticsAction.class.php
new file mode 100644
index 0000000000..d47529abe8
--- /dev/null
+++ b/apps/qubit/modules/settings/actions/diacriticsAction.class.php
@@ -0,0 +1,84 @@
+<?php
+/*
+ * This file is part of the Access to Memory (AtoM) software.
+ *
+ * Access to Memory (AtoM) is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Access to Memory (AtoM) is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Access to Memory (AtoM).  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+class SettingsDiacriticsAction extends SettingsEditAction
+{
+    // Arrays not allowed in class constants
+    public static $NAMES = [
+        'diacritics',
+    ];
+
+    public function earlyExecute()
+    {
+        parent::earlyExecute();
+
+        $this->updateMessage = $this->i18n->__('Diacritics settings saved.');
+
+        $this->settingDefaults = [
+            'diacritics' => 0,
+        ];
+    }
+
+    public function execute($request)
+    {
+        parent::execute($request);
+    }
+
+    public function uploadDiacritics($request)
+    {
+        $file = $request->getFiles('mappings');
+        $diacriticsMappingPath = sfConfig::get('sf_plugins_dir').DIRECTORY_SEPARATOR.'arElasticSearchPlugin'.DIRECTORY_SEPARATOR.'config'.DIRECTORY_SEPARATOR.'diacritics_mapping.yml';
+
+        if (1 === (int) $request->getPostParameters()['diacritics']) {
+            if ('application/x-yaml' === $request->getFiles()['mappings']['type']) {
+                // Move uploaded file to replace diacritics_mapping.yml.
+                try {
+                    $file = Qubit::moveUploadFile($file);
+                } catch (sfException $e) {
+                    $this->getUser()->setFlash('error', $e->getMessage());
+                }
+
+                // Replace /config/diacritics_mapping.yml with uploaded file
+                $uploadMappingPath = $file['tmp_name'];
+                $diacriticsMappings = file_get_contents($uploadMappingPath);
+                file_put_contents($diacriticsMappingPath, $diacriticsMappings);
+                $this->getUser()->setFlash('notice', $this->context->i18n->__('Diacritics setting updated. Rebuild the search index for the changes to be applied.'));
+            } else {
+                QubitSetting::findAndSave('diacritics', 0, ['sourceCulture' => true]);
+                $this->getUser()->setFlash('error', $this->context->i18n->__('Error: Unable to upload diacritics mapping. Must be a YAML file.'));
+            }
+        } else {
+            // Reset diacritics yaml when disabling the setting
+            unlink($diacriticsMappingPath);
+        }
+    }
+
+    protected function addField($name)
+    {
+        switch ($name) {
+            case 'diacritics':
+                $this->form->setDefault($name, $this->settingDefaults[$name]);
+                $this->form->setWidget($name, new sfWidgetFormSelectRadio(['choices' => [0 => $this->i18n->__('Disabled'), 1 => $this->i18n->__('Enabled')]], ['class' => 'radio']));
+                $this->form->setValidator($name, new sfValidatorChoice(['choices' => [1, 0]]));
+                $this->form->setWidget('mappings', new sfWidgetFormInputFile());
+                $this->form->setValidator('mappings', new sfValidatorFile());
+
+                break;
+        }
+    }
+}
diff --git a/apps/qubit/modules/settings/actions/editAction.class.php b/apps/qubit/modules/settings/actions/editAction.class.php
index e868af28d7..acb91d0030 100644
--- a/apps/qubit/modules/settings/actions/editAction.class.php
+++ b/apps/qubit/modules/settings/actions/editAction.class.php
@@ -28,7 +28,7 @@ public function execute($request)
 
         // Handle posted data
         if ($request->isMethod('post')) {
-            $this->form->bind($request->getPostParameters());
+            $this->form->bind($request->getPostParameters(), $request->getFiles());
 
             if ($this->form->isValid()) {
                 $this->processForm();
@@ -39,6 +39,10 @@ public function execute($request)
                     $this->getUser()->setFlash('notice', $this->updateMessage);
                 }
 
+                if (null !== $request->getFiles() && 'SettingsDiacriticsAction' === get_called_class()) {
+                    $this->uploadDiacritics($request);
+                }
+
                 $this->redirect([
                     'module' => $this->getContext()->getModuleName(),
                     'action' => $this->getContext()->getActionName(),
diff --git a/apps/qubit/modules/settings/actions/menuComponent.class.php b/apps/qubit/modules/settings/actions/menuComponent.class.php
index 2948c80290..621f2ae063 100644
--- a/apps/qubit/modules/settings/actions/menuComponent.class.php
+++ b/apps/qubit/modules/settings/actions/menuComponent.class.php
@@ -39,6 +39,10 @@ public function execute($request)
                 'label' => $i18n->__('Default template'),
                 'action' => 'template',
             ],
+            [
+                'label' => $i18n->__('Diacritics'),
+                'action' => 'diacritics',
+            ],
             [
                 'label' => $i18n->__('Digital object derivatives'),
                 'action' => 'digitalObjectDerivatives',
diff --git a/apps/qubit/modules/settings/templates/diacriticsSuccess.php b/apps/qubit/modules/settings/templates/diacriticsSuccess.php
new file mode 100644
index 0000000000..47075e3a6b
--- /dev/null
+++ b/apps/qubit/modules/settings/templates/diacriticsSuccess.php
@@ -0,0 +1,57 @@
+<?php decorate_with('layout_2col.php'); ?>
+
+<?php slot('sidebar'); ?>
+
+  <?php echo get_component('settings', 'menu'); ?>
+
+<?php end_slot(); ?>
+
+<?php slot('title'); ?>
+    <h1><?php echo __('Diacritics settings'); ?></h1>
+<?php end_slot(); ?>
+
+<?php slot('content'); ?>
+
+  <div class="alert alert-info">
+    <p><?php echo __('Please rebuild the search index after uploading diacritics mappings.'); ?></p>
+    <pre>$ php symfony search:populate</pre>
+  </div>
+
+  <?php echo $form->renderGlobalErrors(); ?>
+
+  <?php echo $form->renderFormTag(url_for(['module' => 'settings', 'action' => 'diacritics']), ['method' => 'post']); ?>
+
+    <?php echo $form->renderHiddenFields(); ?>
+
+    <div id="content">
+
+      <table class="table sticky-enabled">
+        <thead>
+          <tr>
+            <th width="30%"><?php echo __('Name'); ?></th>
+            <th><?php echo __('Value'); ?></th>
+          </tr>
+        </thead>
+        <tbody>
+          <tr>
+            <td><?php echo __('Diacritics'); ?></td>
+            <td><?php echo $form->diacritics; ?></td>
+          </tr>
+          <tr>
+            <td><?php echo __('Mappings YAML'); ?></td>
+            <td>
+              <span><?php echo __('YAML file containing char_filter mappings.'); ?></span></br>
+              <?php echo $form->mappings; ?><br/>
+            </td>
+          </tr>
+        </tbody>
+      </table>
+    </div>
+
+    <section class="actions">
+      <input class="c-btn c-btn-submit" type="submit" value="<?php echo __('Save'); ?>"/>
+    </section>
+
+  </form>
+
+<?php end_slot(); ?>
diff --git a/plugins/arDominionB5Plugin/modules/settings/templates/diacriticsSuccess.php b/plugins/arDominionB5Plugin/modules/settings/templates/diacriticsSuccess.php
new file mode 100644
index 0000000000..9185b46e00
--- /dev/null
+++ b/plugins/arDominionB5Plugin/modules/settings/templates/diacriticsSuccess.php
@@ -0,0 +1,57 @@
+<?php decorate_with('layout_2col.php'); ?>
+
+<?php slot('sidebar'); ?>
+
+  <?php echo get_component('settings', 'menu'); ?>
+
+<?php end_slot(); ?>
+
+<?php slot('title'); ?>
+    <h1><?php echo __('Diacritics settings'); ?></h1>
+<?php end_slot(); ?>
+
+<?php slot('content'); ?>
+
+  <div class="alert alert-info">
+    <p><?php echo __('Please rebuild the search index after uploading diacritics mappings.'); ?></p>
+    <pre>$ php symfony search:populate</pre>
+  </div>
+
+  <?php echo $form->renderGlobalErrors(); ?>
+
+  <?php echo $form->renderFormTag(url_for(['module' => 'settings', 'action' => 'diacritics']), ['method' => 'post']); ?>
+
+    <?php echo $form->renderHiddenFields(); ?>
+
+    <div id="content">
+
+      <table class="table sticky-enabled">
+        <thead>
+          <tr>
+            <th width="30%"><?php echo __('Name'); ?></th>
+            <th><?php echo __('Value'); ?></th>
+          </tr>
+        </thead>
+        <tbody>
+          <tr>
+            <td><?php echo __('Diacritics'); ?></td>
+            <td><?php echo $form->diacritics; ?></td>
+          </tr>
+          <tr>
+            <td><?php echo __('Mappings YAML'); ?></td>
+            <td>
+              <span><?php echo __('YAML file containing char_filter mappings.'); ?></span></br>
+              <?php echo $form->mappings; ?><br/>
+            </td>
+          </tr>
+        </tbody>
+      </table>
+    </div>
+
+    <section class="actions">
+      <input class="btn atom-btn-outline-success" type="submit" value="<?php echo __('Save'); ?>"/>
+    </section>
+
+  </form>
+
+<?php end_slot(); ?>
diff --git a/plugins/arElasticSearchPlugin/lib/arElasticSearchPlugin.class.php b/plugins/arElasticSearchPlugin/lib/arElasticSearchPlugin.class.php
index 39862e184d..d28c997178 100644
--- a/plugins/arElasticSearchPlugin/lib/arElasticSearchPlugin.class.php
+++ b/plugins/arElasticSearchPlugin/lib/arElasticSearchPlugin.class.php
@@ -135,6 +135,22 @@ public static function loadMappings()
         return $esMapping;
     }
 
+    public function loadDiacriticsMappings()
+    {
+        // Find diacritics_mapping.yml
+        $diacriticsFinder = sfFinder::type('file')->name('diacritics_mapping.yml');
+        $diacriticsFiles = array_unique(array_merge(
+            $diacriticsFinder->in(sfConfig::get('sf_config_dir')),
+            $diacriticsFinder->in(ProjectConfiguration::getActive()->getPluginSubPaths('/config'))
+        ));
+
+        if (!count($diacriticsFiles)) {
+            throw new sfException('You must create a diacritics_mapping.yml file.');
+        }
+
+        return sfYaml::load(array_shift($diacriticsFiles));
+    }
+
     /**
      * Optimize index.
      *
@@ -468,6 +484,12 @@ public static function modelClassFromQubitObjectClass($className)
      */
     protected function initialize()
     {
+        if (sfConfig::get('app_diacritics')) {
+            $this->config['index']['configuration']['analysis']['char_filter']['diacritics_lowercase'] = $this->loadDiacriticsMappings();
+        }
+
+        $this->loadMappings();
+
         try {
             $this->index->open();
         } catch (Exception $e) {
@@ -479,7 +501,17 @@ protected function initialize()
                     && isset($this->config['index']['configuration']['analysis']['char_filter']['strip_md'])
                 ) {
                     foreach ($this->config['index']['configuration']['analysis']['analyzer'] as $key => $analyzer) {
-                        $this->config['index']['configuration']['analysis']['analyzer'][$key]['char_filter'] = ['strip_md'];
+                        $filters = ['strip_md'];
+
+                        if ($this->config['index']['configuration']['analysis']['analyzer'][$key]['char_filter']) {
+                            $filters = array_merge($filters, $this->config['index']['configuration']['analysis']['analyzer'][$key]['char_filter']);
+                        }
+
+                        if (sfConfig::get('app_diacritics')) {
+                            $filters = array_merge($filters, ['diacritics_lowercase']);
+                        }
+
+                        $this->config['index']['configuration']['analysis']['analyzer'][$key]['char_filter'] = $filters;
                     }
                 }