diff --git a/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockTest.php b/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockTest.php
index bb59f502c30412d869fb30d2018fe2cbb9eaf095..c78dc57e8dcce97f98a9d742e52f4d603866d08e 100644
--- a/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockTest.php
+++ b/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockTest.php
@@ -116,9 +116,9 @@ public function testBlockMigration() {
     $visibility = [];
     $settings = [
       'id' => 'system_menu_block',
-      'label' => '',
+      'label' => 'zu - Test Title 02',
       'provider' => 'system',
-      'label_display' => '0',
+      'label_display' => 'visible',
       'level' => 1,
       'depth' => 0,
     ];
diff --git a/core/modules/content_translation/migration_templates/d6_block_translation.yml b/core/modules/content_translation/migration_templates/d6_block_translation.yml
new file mode 100644
index 0000000000000000000000000000000000000000..7ba6a4b3922c2bac46fa65467b6754941fbed844
--- /dev/null
+++ b/core/modules/content_translation/migration_templates/d6_block_translation.yml
@@ -0,0 +1,68 @@
+id: d6_block_translation
+label: Block translations
+migration_tags:
+  - Drupal 6
+source:
+  plugin: d6_block_translation
+  constants:
+    dest_label: 'settings/label'
+process:
+  langcode: language
+  property: constants/dest_label
+  translation: title
+  id:
+    -
+      plugin: migration_lookup
+      migration: d6_block
+      source:
+        - module
+        - delta
+    -
+      plugin: skip_on_empty
+      method: row
+  plugin:
+    -
+      plugin: static_map
+      bypass: true
+      source:
+        - module
+        - delta
+      map:
+        book:
+          0: book_navigation
+        comment:
+          0: views_block:comments_recent-block_1
+        forum:
+          0: forum_active_block
+          1: forum_new_block
+        locale:
+          0: language_block
+        node:
+          0: node_syndicate_block
+        search:
+          0: search_form_block
+        statistics:
+          0: statistics_popular_block
+        system:
+          0: system_powered_by_block
+        user:
+          0: user_login_block
+          1: system_menu_block:tools
+          2: views_block:who_s_new-block_1
+          3: views_block:who_s_online-who_s_online_block
+    -
+      plugin: block_plugin_id
+    -
+      plugin: skip_on_empty
+      method: row
+  theme:
+    plugin: block_theme
+    source:
+      - theme
+      - default_theme
+      - admin_theme
+destination:
+  plugin: entity:block
+migration_dependencies:
+  required:
+    - d6_block
diff --git a/core/modules/content_translation/src/Plugin/migrate/source/d6/BlockTranslation.php b/core/modules/content_translation/src/Plugin/migrate/source/d6/BlockTranslation.php
new file mode 100644
index 0000000000000000000000000000000000000000..f387b46de104b46bb007230bac54eec71520b3a0
--- /dev/null
+++ b/core/modules/content_translation/src/Plugin/migrate/source/d6/BlockTranslation.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace Drupal\content_translation\Plugin\migrate\source\d6;
+
+use Drupal\block\Plugin\migrate\source\Block;
+
+/**
+ * Gets i18n block data from source database.
+ *
+ * @MigrateSource(
+ *   id = "d6_block_translation",
+ *   source_module = "i18nblocks"
+ * )
+ */
+class BlockTranslation extends Block {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function query() {
+    // Let the parent set the block table to use, but do not use the parent
+    // query. Instead build a query so can use a left join to the selected block
+    // table.
+    parent::query();
+    $query = $this->select('i18n_blocks', 'i18n')
+      ->fields('i18n', ['ibid', 'module', 'delta', 'type', 'language'])
+      ->fields('b', ['bid', 'module', 'delta', 'theme', 'title']);
+    $query->addField('b', 'module', 'block_module');
+    $query->addField('b', 'delta', 'block_delta');
+    $query->leftJoin($this->blockTable, 'b', ('b.module = i18n.module AND b.delta = i18n.delta'));
+    return $query;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {
+    $fields = parent::fields();
+    $fields['language'] = $this->t('Language for this field.');
+    return $fields;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    $ids = parent::getIds();
+    $ids['module']['alias'] = 'b';
+    $ids['delta']['alias'] = 'b';
+    $ids['language']['type'] = 'string';
+    return $ids;
+  }
+
+}
diff --git a/core/modules/content_translation/tests/src/Kernel/Migrate/d6/MigrateBlockContentTranslationTest.php b/core/modules/content_translation/tests/src/Kernel/Migrate/d6/MigrateBlockContentTranslationTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..2612d928a87051d677d479b683f3eaf554b6da3e
--- /dev/null
+++ b/core/modules/content_translation/tests/src/Kernel/Migrate/d6/MigrateBlockContentTranslationTest.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace Drupal\Tests\content_translation\Kernel\Migrate\d6;
+
+use Drupal\Tests\migrate_drupal\Kernel\d6\MigrateDrupal6TestBase;
+
+/**
+ * Tests migration of i18n block translations.
+ *
+ * @group migrate_drupal_6
+ */
+class MigrateBlockContentTranslationTest extends MigrateDrupal6TestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'aggregator',
+    'book',
+    'block',
+    'comment',
+    'forum',
+    'views',
+    'block_content',
+    'content_translation',
+    'language',
+    'statistics',
+    'taxonomy',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->installConfig(['block']);
+    $this->installConfig(['block_content']);
+    $this->installEntitySchema('block_content');
+
+    $this->executeMigrations([
+      'd6_filter_format',
+      'block_content_type',
+      'block_content_body_field',
+      'd6_custom_block',
+      'd6_user_role',
+      'd6_block',
+      'd6_block_translation',
+    ]);
+    block_rebuild();
+  }
+
+  /**
+   * Tests the migration of block title translation.
+   */
+  public function testBlockContentTranslation() {
+    $config = $this->container->get('language_manager')->getLanguageConfigOverride('zu', 'block.block.user_1');
+    $this->assertSame('zu - Test Title 02', $config->get('settings.label'));
+  }
+
+}
diff --git a/core/modules/content_translation/tests/src/Kernel/Plugin/migrate/source/d6/BlockTranslationTest.php b/core/modules/content_translation/tests/src/Kernel/Plugin/migrate/source/d6/BlockTranslationTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..4a0e893191b8697b1f022664d995b21b3d1c2d56
--- /dev/null
+++ b/core/modules/content_translation/tests/src/Kernel/Plugin/migrate/source/d6/BlockTranslationTest.php
@@ -0,0 +1,72 @@
+<?php
+
+namespace Drupal\Tests\content_translation\Kernel\Plugin\migrate\source\d6;
+
+use Drupal\Tests\block\Kernel\Plugin\migrate\source\BlockTest;
+
+/**
+ * Tests i18n block source plugin.
+ *
+ * @covers \Drupal\content_translation\Plugin\migrate\source\d6\BlockTranslation
+ *
+ * @group content_translation
+ */
+class BlockTranslationTest extends BlockTest {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['content_translation'];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function providerSource() {
+    // Test data is the same as BlockTest, but with the addition of i18n_blocks.
+    $tests = parent::providerSource();
+
+    // The source data.
+    $tests[0]['source_data']['i18n_blocks'] = [
+      [
+        'ibid' => 1,
+        'module' => 'block',
+        'delta' => '1',
+        'type' => 0,
+        'language' => 'fr',
+      ],
+      [
+        'ibid' => 2,
+        'module' => 'block',
+        'delta' => '2',
+        'type' => 0,
+        'language' => 'zu',
+      ],
+    ];
+
+    // The expected results.
+    $tests[0]['expected_data'] = [
+      [
+        'bid' => 1,
+        'module' => 'block',
+        'delta' => '1',
+        'title' => 'Test Title 01',
+        'ibid' => 1,
+        'type' => '0',
+        'language' => 'fr',
+      ],
+      [
+        'bid' => 2,
+        'module' => 'block',
+        'delta' => '2',
+        'theme' => 'garland',
+        'title' => 'Test Title 02',
+        'ibid' => 2,
+        'type' => '0',
+        'language' => 'zu',
+      ],
+    ];
+
+    return $tests;
+  }
+
+}
diff --git a/core/modules/migrate_drupal/tests/fixtures/drupal6.php b/core/modules/migrate_drupal/tests/fixtures/drupal6.php
index 4ca588b9c7d5a5746484fd156c8749d774122d0f..1afc5b37f634dd53a672db91b6612a15b070f033 100644
--- a/core/modules/migrate_drupal/tests/fixtures/drupal6.php
+++ b/core/modules/migrate_drupal/tests/fixtures/drupal6.php
@@ -746,7 +746,7 @@
   'throttle' => '0',
   'visibility' => '0',
   'pages' => '',
-  'title' => '',
+  'title' => 'zu - Test Title 02',
   'cache' => '-1',
 ))
 ->values(array(
@@ -8530,6 +8530,23 @@
   'mysql_character_set' => 'utf8',
 ));
 
+$connection->insert('i18n_blocks')
+->fields(array(
+  'ibid',
+  'module',
+  'delta',
+  'type',
+  'language',
+))
+->values(array(
+  'ibid' => '1',
+  'module' => 'user',
+  'delta' => '1',
+  'type' => '0',
+  'language' => 'zu',
+))
+->execute();
+
 $connection->schema()->createTable('i18n_strings', array(
   'fields' => array(
     'lid' => array(