diff --git a/modules/promotion/src/Plugin/Commerce/PromotionCondition/OrderTotalItems.php b/modules/promotion/src/Plugin/Commerce/PromotionCondition/OrderTotalItems.php
new file mode 100644
index 0000000000..95478c4c1d
--- /dev/null
+++ b/modules/promotion/src/Plugin/Commerce/PromotionCondition/OrderTotalItems.php
@@ -0,0 +1,105 @@
+<?php
+
+namespace Drupal\commerce_promotion\Plugin\Commerce\PromotionCondition;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\commerce_price\Price;
+
+/**
+ * Provides an 'Order: Total items' condition.
+ *
+ * @CommercePromotionCondition(
+ *   id = "commerce_promotion_order_total_items",
+ *   label = @Translation("Total items"),
+ *   target_entity_type = "commerce_order",
+ * )
+ */
+class OrderTotalItems extends PromotionConditionBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [
+      'qty' => NULL,
+      'operator' => '>=',
+    ] + parent::defaultConfiguration();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    $form = parent::buildConfigurationForm($form, $form_state);
+
+    $form['operator'] = [
+      '#type' => 'select',
+      '#title' => t('Operator'),
+      '#options' => $this->getComparisonOperators(),
+      '#default_value' => $this->configuration['operator'],
+      '#required' => TRUE,
+    ];
+    $form['qty'] = [
+      '#type' => 'number',
+      '#step' => 1,
+      '#title' => t('Quantity'),
+      '#default_value' => $this->configuration['qty'],
+      '#required' => TRUE,
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+    parent::submitConfigurationForm($form, $form_state);
+
+    $values = $form_state->getValue($form['#parents']);
+    $this->configuration['qty'] = $values['qty'];
+    $this->configuration['operator'] = $values['operator'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function evaluate() {
+    $qty = $this->configuration['qty'];
+    /** @var \Drupal\commerce_order\Entity\OrderInterface $order */
+    $order = $this->getTargetEntity();
+    $total_items = 0;
+    foreach ($order->getItems() as $item) {
+      $total_items += (int) $item->getQuantity();
+    }
+
+    switch ($this->configuration['operator']) {
+      case '>=':
+        return $total_items >= $qty;
+
+      case '>':
+        return $total_items > $qty;
+
+      case '<=':
+        return $total_items <= $qty;
+
+      case '<':
+        return $total_items < $qty;
+
+      case '==':
+        return $total_items == $qty;
+
+      default:
+        return FALSE;
+    }
+
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function summary() {
+    return $this->t('Compares the total quantity of order items.');
+  }
+
+}
diff --git a/modules/promotion/tests/src/Kernel/PromotionConditionTest.php b/modules/promotion/tests/src/Kernel/PromotionConditionTest.php
index 865bfde37e..b0058bd3be 100644
--- a/modules/promotion/tests/src/Kernel/PromotionConditionTest.php
+++ b/modules/promotion/tests/src/Kernel/PromotionConditionTest.php
@@ -158,6 +158,76 @@ public function testOrderTotal() {
     $this->assertFalse($result);
   }
 
+  /**
+   * Tests the order total items condition.
+   */
+  public function testOrderTotalItems() {
+    // Use addOrderItem so the total is calculated.
+    $order_item = OrderItem::create([
+      'type' => 'test',
+      'quantity' => 10,
+      'unit_price' => [
+        'number' => '10.00',
+        'currency_code' => 'USD',
+      ],
+    ]);
+    $order_item->save();
+    $this->order->addItem($order_item);
+
+    // Starts now, enabled. No end time.
+    $promotion = Promotion::create([
+      'name' => 'Promotion 1',
+      'order_types' => [$this->order->bundle()],
+      'stores' => [$this->store->id()],
+      'status' => TRUE,
+      'offer' => [
+        'target_plugin_id' => 'commerce_promotion_order_percentage_off',
+        'target_plugin_configuration' => [
+          'amount' => '0.10',
+        ],
+      ],
+      'conditions' => [
+        [
+          'target_plugin_id' => 'commerce_promotion_order_total_items',
+          'target_plugin_configuration' => [
+            'qty' => '10',
+            'operator' => '>=',
+          ],
+        ],
+      ],
+    ]);
+    $promotion->save();
+
+    $result = $promotion->applies($this->order);
+    $this->assertTrue($result);
+
+    $promotion = Promotion::create([
+      'name' => 'Promotion 1',
+      'order_types' => [$this->order->bundle()],
+      'stores' => [$this->store->id()],
+      'status' => TRUE,
+      'offer' => [
+        'target_plugin_id' => 'commerce_promotion_order_percentage_off',
+        'target_plugin_configuration' => [
+          'amount' => '0.10',
+        ],
+      ],
+      'conditions' => [
+        [
+          'target_plugin_id' => 'commerce_promotion_order_total_items',
+          'target_plugin_configuration' => [
+            'qty' => '11',
+            'operator' => '>=',
+          ],
+        ],
+      ],
+    ]);
+    $promotion->save();
+
+    $result = $promotion->applies($this->order);
+    $this->assertFalse($result);
+  }
+
   /**
    * Tests the specific SKU test condition.
    */