diff --git a/core/modules/views/templates/views-view-unformatted.html.twig b/core/modules/views/templates/views-view-unformatted.html.twig
new file mode 100644
index 000000000000..47a66cf7ce68
--- /dev/null
+++ b/core/modules/views/templates/views-view-unformatted.html.twig
@@ -0,0 +1,24 @@
+{#
+/**
+ * @file
+ * Default theme implementation to display a view of unformatted rows.
+ *
+ * Available variables:
+ * - title: The title of this group of rows. May be empty.
+ * - rows: A list of the view's row items.
+ * - row_classes: A list of row class attributes keyed by the row's ID.
+ *
+ * @see template_preprocess()
+ * @see template_preprocess_views_view_unformatted()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if title %}
+  <h3>{{ title }}</h3>
+{% endif %}
+{% for id, row in rows %}
+  <div{{ row_classes[id] }}>
+    {{ row }}
+  </div>
+{% endfor %}
diff --git a/core/modules/views/templates/views-view-unformatted.tpl.php b/core/modules/views/templates/views-view-unformatted.tpl.php
deleted file mode 100644
index b7f63b9b77ec..000000000000
--- a/core/modules/views/templates/views-view-unformatted.tpl.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-/**
- * @file
- * Default simple view template to display a list of rows.
- *
- * @ingroup views_templates
- */
-?>
-<?php if (!empty($title)): ?>
-  <h3><?php print $title; ?></h3>
-<?php endif; ?>
-<?php foreach ($rows as $id => $row): ?>
-  <div <?php print $row_classes[$id]; ?>>
-    <?php print $row; ?>
-  </div>
-<?php endforeach; ?>
diff --git a/core/modules/views/views.theme.inc b/core/modules/views/views.theme.inc
index 4c3cab8e63cb..7f13ad8bfcf9 100644
--- a/core/modules/views/views.theme.inc
+++ b/core/modules/views/views.theme.inc
@@ -782,7 +782,14 @@ function template_preprocess_views_view_grid(&$vars) {
 }
 
 /**
- * Display the simple view of rows one after another
+ * Prepares variables for views unformatted rows templates.
+ *
+ * Default template: views-view-unformatted.html.twig.
+ *
+ * @param array $vars
+ *   An associative array containing:
+ *   - view: The view object.
+ *   - rows: An array of row items. Each row is an array of content.
  */
 function template_preprocess_views_view_unformatted(&$vars) {
   $view = $vars['view'];
@@ -1108,7 +1115,7 @@ function theme_views_mini_pager($vars) {
  * example, arguments which provide a summary view might change the style to
  * one of the special summary styles.
  *
- * The default style for all views is views-view-unformatted.tpl.php
+ * The default style for all views is views-view-unformatted.html.twig.
  *
  * Many styles will then farm out the actual display of each row to a row
  * style; the default row style is views-view-fields.tpl.php.
@@ -1123,10 +1130,10 @@ function theme_views_mini_pager($vars) {
  * - views-view--foobar.tpl.php
  * - views-view.tpl.php
  *
- * - views-view-unformatted--foobar--page.tpl.php
- * - views-view-unformatted--page.tpl.php
- * - views-view-unformatted--foobar.tpl.php
- * - views-view-unformatted.tpl.php
+ * - views-view-unformatted--foobar--page.html.twig
+ * - views-view-unformatted--page.html.twig
+ * - views-view-unformatted--foobar.html.twig
+ * - views-view-unformatted.html.twig
  *
  * - views-view-fields--foobar--page.tpl.php
  * - views-view-fields--page.tpl.php