diff --git a/CHANGES b/CHANGES
index f6181d90175..341f3029644 100644
--- a/CHANGES
+++ b/CHANGES
@@ -37,6 +37,8 @@ Features added
 * #8070: html search: Support searching for 2characters word
 * #7830: Add debug logs for change detection of sources and templates
 * #8201: Emit a warning if toctree contains duplicated entries
+* Allow to suppress "duplicated ToC entry found" warnings from epub builder using
+  :confval:`suppress_warnings`.
 
 Bugs fixed
 ----------
diff --git a/doc/usage/configuration.rst b/doc/usage/configuration.rst
index b4682dd21bd..5421e029596 100644
--- a/doc/usage/configuration.rst
+++ b/doc/usage/configuration.rst
@@ -316,6 +316,7 @@ General configuration
    * ``toc.circular``
    * ``toc.secnum``
    * ``epub.unknown_project_files``
+   * ``epub.duplicated_toc_entry``
    * ``autosectionlabel.*``
 
    You can choose from these types.
@@ -340,6 +341,11 @@ General configuration
 
       Added ``autosectionlabel.*``
 
+
+   .. versionchanged:: 3.2.2
+
+      Added ``epub.duplicated_toc_entry``
+
 .. confval:: needs_sphinx
 
    If set to a ``major.minor`` version string like ``'1.1'``, Sphinx will
diff --git a/sphinx/builders/_epub_base.py b/sphinx/builders/_epub_base.py
index 7a2c102072e..6a2b312d90a 100644
--- a/sphinx/builders/_epub_base.py
+++ b/sphinx/builders/_epub_base.py
@@ -213,7 +213,12 @@ def check_refnodes(self, nodes: List[Dict[str, Any]]) -> None:
         appeared = set()  # type: Set[str]
         for node in nodes:
             if node['refuri'] in appeared:
-                logger.warning(__('duplicated ToC entry found: %s'), node['refuri'])
+                logger.warning(
+                    __('duplicated ToC entry found: %s'),
+                    node['refuri'],
+                    type="epub",
+                    subtype="duplicated_toc_entry",
+                )
             else:
                 appeared.add(node['refuri'])