diff --git a/core/modules/migrate/src/Plugin/migrate/process/Download.php b/core/modules/migrate/src/Plugin/migrate/process/Download.php
new file mode 100644
index 0000000..08c9b57
--- /dev/null
+++ b/core/modules/migrate/src/Plugin/migrate/process/Download.php
@@ -0,0 +1,117 @@
+<?php
+
+namespace Drupal\migrate\Plugin\migrate\process;
+
+use Drupal\Core\File\FileSystemInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\migrate\MigrateException;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+use GuzzleHttp\Client;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Downloads a file from a remote location into the local file system.
+ *
+ * @MigrateProcessPlugin(
+ *   id = "download"
+ * )
+ */
+class Download extends ProcessPluginBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * The file system service.
+   *
+   * @var \Drupal\Core\File\FileSystemInterface
+   */
+  protected $fileSystem;
+
+  /**
+   * The Guzzle HTTP Client service.
+   *
+   * @var \GuzzleHttp\Client
+   */
+  protected $httpClient;
+
+  /**
+   * Constructs a download process plugin.
+   *
+   * @param array $configuration
+   *   The plugin configuration.
+   * @param string $plugin_id
+   *   The plugin ID.
+   * @param mixed $plugin_definition
+   *   The plugin definition.
+   * @param \Drupal\Core\File\FileSystemInterface $file_system
+   *   The file system service.
+   * @param \GuzzleHttp\Client $http_client
+   *   The HTTP client.
+   */
+  public function __construct(array $configuration, $plugin_id, array $plugin_definition, FileSystemInterface $file_system, Client $http_client) {
+    $configuration += [
+      'rename' => FALSE,
+      'guzzle_options' => [],
+    ];
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->fileSystem = $file_system;
+    $this->httpClient = $http_client;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('file_system'),
+      $container->get('http_client')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+    // If we're stubbing a file entity, return a uri of NULL so it will get
+    // stubbed by the general process.
+    if ($row->isStub()) {
+      return NULL;
+    }
+    list($source, $destination) = $value;
+
+    // Modify the destination filename if necessary.
+    $replace = !empty($this->configuration['rename']) ?
+      FILE_EXISTS_RENAME :
+      FILE_EXISTS_REPLACE;
+    $final_destination = file_destination($destination, $replace);
+
+    // Try opening the file first, to avoid calling file_prepare_directory()
+    // unnecessarily. We're suppressing fopen() errors because we want to try
+    // to prepare the directory before we give up and fail.
+    $destination_stream = @fopen($final_destination, 'w');
+    if (!$destination_stream) {
+      // If fopen didn't work, make sure there's a writable directory in place.
+      $dir = $this->fileSystem->dirname($final_destination);
+      if (!file_prepare_directory($dir, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS)) {
+        throw new MigrateException("Could not create or write to directory '$dir'");
+      }
+      // Let's try that fopen again.
+      $destination_stream = @fopen($final_destination, 'w');
+      if (!$destination_stream) {
+        throw new MigrateException("Could not write to file '$final_destination'");
+      }
+    }
+
+    // Stream the request body directly to the final destination stream.
+    $this->configuration['guzzle_options']['sink'] = $destination_stream;
+
+    // Make the request. Guzzle throws an exception for anything other than 200.
+    $this->httpClient->get($source, $this->configuration['guzzle_options']);
+
+    return $final_destination;
+  }
+
+}
diff --git a/core/modules/migrate/tests/src/Unit/process/DownloadTest.php b/core/modules/migrate/tests/src/Unit/process/DownloadTest.php
new file mode 100644
index 0000000..e4de42e
--- /dev/null
+++ b/core/modules/migrate/tests/src/Unit/process/DownloadTest.php
@@ -0,0 +1,128 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\Core\StreamWrapper\StreamWrapperInterface;
+use Drupal\KernelTests\Core\File\FileTestBase;
+use Drupal\migrate\MigrateException;
+use Drupal\migrate\Plugin\migrate\process\Download;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\Row;
+use GuzzleHttp\Client;
+use GuzzleHttp\Psr7\Response;
+
+/**
+ * Tests the download process plugin.
+ *
+ * @group migrate
+ */
+class DownloadTest extends FileTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['system'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->container->get('stream_wrapper_manager')->registerWrapper('temporary', 'Drupal\Core\StreamWrapper\TemporaryStream', StreamWrapperInterface::LOCAL_NORMAL);
+  }
+
+  /**
+   * Tests a download that overwrites an existing local file.
+   */
+  public function testOverwritingDownload() {
+    // Create a pre-existing file at the destination, to test overwrite behavior.
+    $destination_uri = $this->createUri('existing_file.txt');
+
+    // Test destructive download.
+    $actual_destination = $this->doTransform($destination_uri);
+    $this->assertSame($destination_uri, $actual_destination, 'Import returned a destination that was not renamed');
+    $this->assertFileNotExists('public://existing_file_0.txt', 'Import did not rename the file');
+  }
+
+  /**
+   * Tests a download that renames the downloaded file if there's a collision.
+   */
+  public function testNonDestructiveDownload() {
+    // Create a pre-existing file at the destination, to test overwrite behavior.
+    $destination_uri = $this->createUri('another_existing_file.txt');
+
+    // Test non-destructive download.
+    $actual_destination = $this->doTransform($destination_uri, ['rename' => TRUE]);
+    $this->assertSame('public://another_existing_file_0.txt', $actual_destination, 'Import returned a renamed destination');
+    $this->assertFileExists($actual_destination, 'Downloaded file was created');
+  }
+
+  /**
+   * Tests that an exception is thrown if the destination URI is not writable.
+   */
+  public function testWriteProectedDestination() {
+    // Create a pre-existing file at the destination, to test overwrite behavior.
+    $destination_uri = $this->createUri('not-writable.txt');
+
+    // Make the destination non-writable.
+    $this->container
+      ->get('file_system')
+      ->chmod($destination_uri, 0444);
+
+    // Pass or fail, we'll need to make the file writable again so the test
+    // can clean up after itself.
+    $fix_permissions = function () use ($destination_uri) {
+      $this->container
+        ->get('file_system')
+        ->chmod($destination_uri, 0755);
+    };
+
+    try {
+      $this->doTransform($destination_uri);
+      $fix_permissions();
+      $this->fail('MigrateException was not thrown for non-writable destination URI.');
+    }
+    catch (MigrateException $e) {
+      $this->assertTrue(TRUE, 'MigrateException was thrown for non-writable destination URI.');
+      $fix_permissions();
+    }
+  }
+
+  /**
+   * Runs an input value through the download plugin.
+   *
+   * @param string $destination_uri
+   *   The destination URI to download to.
+   * @param array $configuration
+   *   (optional) Configuration for the download plugin.
+   *
+   * @return string
+   *   The local URI of the downloaded file.
+   */
+  protected function doTransform($destination_uri, $configuration = []) {
+    // The HTTP client will return a file with contents 'It worked!'
+    $body = fopen('data://text/plain;base64,SXQgd29ya2VkIQ==', 'r');
+
+    // Prepare a mock HTTP client.
+    $this->container->set('http_client', $this->getMock(Client::class));
+    $this->container->get('http_client')
+      ->method('get')
+      ->willReturn(new Response(200, [], $body));
+
+    // Instantiate the plugin statically so it can pull dependencies out of
+    // the container.
+    $plugin = Download::create($this->container, $configuration, 'download', []);
+
+    // Execute the transformation.
+    $executable = $this->getMock(MigrateExecutableInterface::class);
+    $row = new Row([], []);
+
+    // Return the downloaded file's local URI.
+    $value = [
+      'http://drupal.org/favicon.ico',
+      $destination_uri,
+    ];
+    return $plugin->transform($value, $executable, $row, 'foobaz');
+  }
+
+}