diff --git a/core/themes/stable/templates/dataset/item-list--splitbutton.html.twig b/core/themes/stable/templates/dataset/item-list--splitbutton.html.twig
new file mode 100644
index 0000000000..4d3a96dbe9
--- /dev/null
+++ b/core/themes/stable/templates/dataset/item-list--splitbutton.html.twig
@@ -0,0 +1,20 @@
+{#
+/**
+ * @file
+ * Theme override for an item list used by splitbuttons.
+ *
+ * Available variables:
+ * - items: A list of items. Each item contains:
+ *   - attributes: HTML attributes to be applied to each list item.
+ *   - value: The content of the list element.
+ * - list_type: The tag for list element ("ul" or "ol").
+ * - attributes: HTML attributes to be applied to the list.
+ */
+#}
+{% if items %}
+    <{{ list_type }} {{ attributes }}>
+        {%- for item in items -%}
+            <li{{ item.attributes }}>{{ item.value }}</li>
+        {%- endfor -%}
+    </{{ list_type }}>
+{%- endif %}
diff --git a/core/themes/stable9/templates/dataset/item-list--splitbutton.html.twig b/core/themes/stable9/templates/dataset/item-list--splitbutton.html.twig
new file mode 100644
index 0000000000..4d3a96dbe9
--- /dev/null
+++ b/core/themes/stable9/templates/dataset/item-list--splitbutton.html.twig
@@ -0,0 +1,20 @@
+{#
+/**
+ * @file
+ * Theme override for an item list used by splitbuttons.
+ *
+ * Available variables:
+ * - items: A list of items. Each item contains:
+ *   - attributes: HTML attributes to be applied to each list item.
+ *   - value: The content of the list element.
+ * - list_type: The tag for list element ("ul" or "ol").
+ * - attributes: HTML attributes to be applied to the list.
+ */
+#}
+{% if items %}
+    <{{ list_type }} {{ attributes }}>
+        {%- for item in items -%}
+            <li{{ item.attributes }}>{{ item.value }}</li>
+        {%- endfor -%}
+    </{{ list_type }}>
+{%- endif %}