diff --git a/src/Element/WebformMapping.php b/src/Element/WebformMapping.php
index f8f027de..9e3b0686 100644
--- a/src/Element/WebformMapping.php
+++ b/src/Element/WebformMapping.php
@@ -14,6 +14,11 @@ use Drupal\Core\Render\Element\FormElement;
 class WebformMapping extends FormElement {
 
   /**
+   * Require all.
+   */
+  const REQUIRED_ALL = 'all';
+
+  /**
    * {@inheritdoc}
    */
   public function getInfo() {
@@ -53,8 +58,9 @@ class WebformMapping extends FormElement {
     // Set base destination element.
     $destination_element_base = [
       '#title_display' => 'invisible',
-      '#required' => $element['#required'],
+      '#required' => ($element['#required'] === self::REQUIRED_ALL) ? TRUE : FALSE,
     ];
+
     // Get base #destination__* properties.
     foreach ($element as $element_key => $element_value) {
       if (strpos($element_key, '#destination__') === 0 && !in_array($element_key, ['#destination__title'])) {
@@ -104,6 +110,10 @@ class WebformMapping extends FormElement {
       ],
     ] + $rows;
 
+
+    // Cast required to boolean since, it can be set to self::REQUIRED_ALL.
+    $element['#required'] = (bool) $element['#required'];
+
     $element['#element_validate'] = [[get_called_class(), 'validateWebformMapping']];
 
     return $element;
@@ -114,8 +124,25 @@ class WebformMapping extends FormElement {
    * Validates a mapping element.
    */
   public static function validateWebformMapping(&$element, FormStateInterface $form_state, &$complete_form) {
-    $values = NestedArray::getValue($form_state->getValues(), $element['#parents']);
-    $form_state->setValueForElement($element, array_filter($values));
+    $value = NestedArray::getValue($form_state->getValues(), $element['#parents']);
+    $value = array_filter($value);
+
+    $has_access = (!isset($element['#access']) || $element['#access'] === TRUE);
+    // Note: Not validating REQUIRED_ALL because each destination element is
+    // already required.
+    if ($element['#required'] && $element['#required'] !== self::REQUIRED_ALL && empty($value) && $has_access) {
+      if (isset($element['#required_error'])) {
+        $form_state->setError($element, $element['#required_error']);
+      }
+      elseif (isset($element['#title'])) {
+        $form_state->setError($element, t('@name field is required.', ['@name' => $element['#title']]));
+      }
+      else {
+        $form_state->setError($element);
+      }
+    }
+
+    $form_state->setValueForElement($element, $value);
   }
 
 }
diff --git a/src/Plugin/WebformElement/WebformMapping.php b/src/Plugin/WebformElement/WebformMapping.php
index d803a0fb..05f2e44d 100644
--- a/src/Plugin/WebformElement/WebformMapping.php
+++ b/src/Plugin/WebformElement/WebformMapping.php
@@ -40,6 +40,7 @@ class WebformMapping extends WebformElementBase {
       'description_display' => '',
       // Form validation.
       'required' => FALSE,
+      'required_error' => '',
       // Submission display.
       'format' => $this->getItemDefaultFormat(),
       // Mapping settings.
diff --git a/src/Tests/Element/WebformElementMappingTest.php b/src/Tests/Element/WebformElementMappingTest.php
index e757b59b..30558707 100644
--- a/src/Tests/Element/WebformElementMappingTest.php
+++ b/src/Tests/Element/WebformElementMappingTest.php
@@ -40,11 +40,27 @@ class WebformElementMappingTest extends WebformTestBase {
     // Check custom textfield #size property.
     $this->assertRaw('<input data-drupal-selector="edit-webform-mapping-textfield-one" type="text" id="edit-webform-mapping-textfield-one" name="webform_mapping_textfield[one]" value="" size="10" maxlength="128" class="form-text" />');
 
+    // Check required.
+    $this->drupalPostForm('webform/test_element_mapping', [], t('Submit'));
+    $this->assertRaw('webform_mapping_required field is required.');
+    $this->assertRaw('One field is required.');
+    $this->assertRaw('Two field is required.');
+    $this->assertRaw('Three field is required.');
+
+    // Check that required all element does not display error since all the
+    // destination elements are required.
+    // @see \Drupal\webform\Element\WebformMapping::validateWebformMapping
+    $this->assertNoRaw('webform_mapping_required_all field is required.');
+
     // Check processing.
     $edit = [
       'webform_mapping[one]' => 'four',
       'webform_mapping[two]' => '',
       'webform_mapping[three]' => 'six',
+      'webform_mapping_required[one]' => 'four',
+      'webform_mapping_required_all[one]' => 'four',
+      'webform_mapping_required_all[two]' => 'five',
+      'webform_mapping_required_all[three]' => 'six',
       'webform_mapping_custom[Sunday]' => 'four',
       'webform_mapping_custom[Monday]' => 'four',
       'webform_mapping_custom[Tuesday]' => 'four',
@@ -75,6 +91,12 @@ webform_mapping_custom:
   Thursday: four
   Friday: four
   Saturday: four
+webform_mapping_required:
+  one: four
+webform_mapping_required_all:
+  one: four
+  two: five
+  three: six
 webform_mapping_select_other:
   one: five
   two: five
diff --git a/tests/modules/webform_test/config/install/webform.webform.test_element_mapping.yml b/tests/modules/webform_test/config/install/webform.webform.test_element_mapping.yml
index 3179f853..cc443e5b 100644
--- a/tests/modules/webform_test/config/install/webform.webform.test_element_mapping.yml
+++ b/tests/modules/webform_test/config/install/webform.webform.test_element_mapping.yml
@@ -40,6 +40,30 @@ elements: |
         four: Four
         five: Five
         six: Six
+    webform_mapping_required:
+      '#type': webform_mapping
+      '#title': webform_mapping_required
+      '#required': true
+      '#source':
+        one: One
+        two: Two
+        three: Three
+      '#destination':
+        four: Four
+        five: Five
+        six: Six
+    webform_mapping_required_all:
+      '#type': webform_mapping
+      '#title': webform_mapping_required_all
+      '#required': all
+      '#source':
+        one: One
+        two: Two
+        three: Three
+      '#destination':
+        four: Four
+        five: Five
+        six: Six
   webform_mapping_select_other_elements:
     '#type': details
     '#title': webform_mapping_select_other_elements