diff --git a/core/modules/workflows/src/ProxyClass/WorkflowsUninstallValidator.php b/core/modules/workflows/src/ProxyClass/WorkflowsUninstallValidator.php
new file mode 100644
index 0000000..a3fe435
--- /dev/null
+++ b/core/modules/workflows/src/ProxyClass/WorkflowsUninstallValidator.php
@@ -0,0 +1,88 @@
+<?php
+// @codingStandardsIgnoreFile
+
+/**
+ * This file was generated via php core/scripts/generate-proxy-class.php 'Drupal\workflows\WorkflowsUninstallValidator' "core/modules/workflows/src".
+ */
+
+namespace Drupal\workflows\ProxyClass {
+
+    /**
+     * Provides a proxy class for \Drupal\workflows\WorkflowsUninstallValidator.
+     *
+     * @see \Drupal\Component\ProxyBuilder
+     */
+    class WorkflowsUninstallValidator implements \Drupal\Core\Extension\ModuleUninstallValidatorInterface
+    {
+
+        use \Drupal\Core\DependencyInjection\DependencySerializationTrait;
+
+        /**
+         * The id of the original proxied service.
+         *
+         * @var string
+         */
+        protected $drupalProxyOriginalServiceId;
+
+        /**
+         * The real proxied service, after it was lazy loaded.
+         *
+         * @var \Drupal\workflows\WorkflowsUninstallValidator
+         */
+        protected $service;
+
+        /**
+         * The service container.
+         *
+         * @var \Symfony\Component\DependencyInjection\ContainerInterface
+         */
+        protected $container;
+
+        /**
+         * Constructs a ProxyClass Drupal proxy object.
+         *
+         * @param \Symfony\Component\DependencyInjection\ContainerInterface $container
+         *   The container.
+         * @param string $drupal_proxy_original_service_id
+         *   The service ID of the original service.
+         */
+        public function __construct(\Symfony\Component\DependencyInjection\ContainerInterface $container, $drupal_proxy_original_service_id)
+        {
+            $this->container = $container;
+            $this->drupalProxyOriginalServiceId = $drupal_proxy_original_service_id;
+        }
+
+        /**
+         * Lazy loads the real service from the container.
+         *
+         * @return object
+         *   Returns the constructed real service.
+         */
+        protected function lazyLoadItself()
+        {
+            if (!isset($this->service)) {
+                $this->service = $this->container->get($this->drupalProxyOriginalServiceId);
+            }
+
+            return $this->service;
+        }
+
+        /**
+         * {@inheritdoc}
+         */
+        public function validate($module)
+        {
+            return $this->lazyLoadItself()->validate($module);
+        }
+
+        /**
+         * {@inheritdoc}
+         */
+        public function setStringTranslation(\Drupal\Core\StringTranslation\TranslationInterface $translation)
+        {
+            return $this->lazyLoadItself()->setStringTranslation($translation);
+        }
+
+    }
+
+}
diff --git a/core/modules/workflows/src/WorkflowsUninstallValidator.php b/core/modules/workflows/src/WorkflowsUninstallValidator.php
new file mode 100644
index 0000000..085f183
--- /dev/null
+++ b/core/modules/workflows/src/WorkflowsUninstallValidator.php
@@ -0,0 +1,85 @@
+<?php
+
+namespace Drupal\workflows;
+
+use Drupal\Component\Plugin\PluginManagerInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Extension\ModuleUninstallValidatorInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+
+/**
+ * Prevents book module from being uninstalled whilst any book nodes exist or
+ * there are any book outline stored.
+ */
+class WorkflowsUninstallValidator implements ModuleUninstallValidatorInterface {
+
+  use StringTranslationTrait;
+
+  /**
+   * The workflow type plugin manager.
+   *
+   * @var \Drupal\Component\Plugin\PluginManagerInterface
+   */
+  protected $workflowTypeManager;
+
+  /**
+   * The entity type manager.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * Constructs a WorkflowsUninstallValidator class.
+   *
+   * @param \Drupal\Component\Plugin\PluginManagerInterface $workflow_type_manager
+   *   The workflow type plugin manager.
+
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type manager.
+   */
+  public function __construct(PluginManagerInterface $workflow_type_manager, EntityTypeManagerInterface $entity_type_manager) {
+    $this->workflowTypeManager = $workflow_type_manager;
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validate($module) {
+    $reasons = [];
+
+    // Get a list of workflow type plugins defined by the module that is about
+    // to be uninstalled.
+    $workflow_types = [];
+    foreach ($this->workflowTypeManager->getDefinitions() as $plugin_id => $definition) {
+      if ($definition['provider'] === $module) {
+        $workflow_types[] = $plugin_id;
+      }
+    };
+
+    // Find all the workflow config entities using those workflow types and
+    // prevent the module from being uninstalled if any one of them are still in
+    // use.
+    if ($workflow_types) {
+      $workflow_ids = $this->entityTypeManager->getStorage('workflow')->getQuery()
+        ->condition('type', $workflow_types, 'IN')
+        ->execute();
+
+      /** @var \Drupal\workflows\WorkflowInterface[] $workflows */
+      $workflows = $workflow_ids ? $this->entityTypeManager->getStorage('workflow')->loadMultiple($workflow_ids) : [];
+
+      foreach ($workflows as $workflow) {
+        if ($workflow->getTypePlugin()->workflowHasData($workflow)) {
+          $reasons[] = $this->t('The %workflow_label workflow contains data.', [
+            '%workflow_label' => $workflow->label(),
+          ]);
+        }
+      }
+
+    }
+
+    return $reasons;
+  }
+
+}
diff --git a/core/modules/workflows/workflows.services.yml b/core/modules/workflows/workflows.services.yml
index 7d32420..0facfe0 100644
--- a/core/modules/workflows/workflows.services.yml
+++ b/core/modules/workflows/workflows.services.yml
@@ -8,3 +8,9 @@ services:
     class: \Drupal\workflows\WorkflowDeleteAccessCheck
     tags:
       - { name: access_check, applies_to: _workflow_state_delete_access }
+  workflows.uninstall_validator:
+    class: Drupal\workflows\WorkflowsUninstallValidator
+    tags:
+      - { name: module_install.uninstall_validator }
+    arguments: ['@plugin.manager.workflows.type', '@entity_type.manager']
+    lazy: true