diff --git a/sphinx/themes/agogo/layout.html b/sphinx/themes/agogo/layout.html
index cfd7ee38b..aca2e1e33 100644
--- a/sphinx/themes/agogo/layout.html
+++ b/sphinx/themes/agogo/layout.html
@@ -14,13 +14,13 @@
     <div class="header-wrapper" role="banner">
       <div class="header">
         {%- if logo %}
-          <p class="logo"><a href="{{ pathto(master_doc) }}">
+          <p class="logo"><a href="{{ pathto(master_doc)|e }}">
             <img class="logo" src="{{ pathto('_static/' + logo, 1) }}" alt="Logo"/>
           </a></p>
         {%- endif %}
         {%- block headertitle %}
         <div class="headertitle"><a
-          href="{{ pathto(master_doc) }}">{{ shorttitle|e }}</a></div>
+          href="{{ pathto(master_doc)|e }}">{{ shorttitle|e }}</a></div>
         {%- endblock %}
         <div class="rel" role="navigation" aria-label="related navigation">
           {%- for rellink in rellinks|reverse %}
diff --git a/sphinx/themes/basic/globaltoc.html b/sphinx/themes/basic/globaltoc.html
index 49c1dac08..59cab989b 100644
--- a/sphinx/themes/basic/globaltoc.html
+++ b/sphinx/themes/basic/globaltoc.html
@@ -7,5 +7,5 @@
     :copyright: Copyright 2007-2020 by the Sphinx team, see AUTHORS.
     :license: BSD, see LICENSE for details.
 #}
-<h3><a href="{{ pathto(master_doc) }}">{{ _('Table of Contents') }}</a></h3>
+<h3><a href="{{ pathto(master_doc)|e }}">{{ _('Table of Contents') }}</a></h3>
 {{ toctree() }}
diff --git a/sphinx/themes/basic/layout.html b/sphinx/themes/basic/layout.html
index 9692ea2c4..812420eaf 100644
--- a/sphinx/themes/basic/layout.html
+++ b/sphinx/themes/basic/layout.html
@@ -37,7 +37,7 @@
           {%- if not loop.first %}{{ reldelim2 }}{% endif %}</li>
         {%- endfor %}
         {%- block rootrellink %}
-        <li class="nav-item nav-item-0"><a href="{{ pathto(master_doc) }}">{{ shorttitle|e }}</a>{{ reldelim1 }}</li>
+        <li class="nav-item nav-item-0"><a href="{{ pathto(master_doc)|e }}">{{ shorttitle|e }}</a>{{ reldelim1 }}</li>
         {%- endblock %}
         {%- for parent in parents %}
           <li class="nav-item nav-item-{{ loop.index }}"><a href="{{ parent.link|e }}" {% if loop.last %}{{ accesskey("U") }}{% endif %}>{{ parent.title }}</a>{{ reldelim1 }}</li>
@@ -53,7 +53,7 @@
         <div class="sphinxsidebarwrapper">
           {%- block sidebarlogo %}
           {%- if logo %}
-            <p class="logo"><a href="{{ pathto(master_doc) }}">
+            <p class="logo"><a href="{{ pathto(master_doc)|e }}">
               <img class="logo" src="{{ pathto('_static/' + logo, 1) }}" alt="Logo"/>
             </a></p>
           {%- endif %}
diff --git a/sphinx/themes/basic/localtoc.html b/sphinx/themes/basic/localtoc.html
index 5ecacad0d..0e1c5511b 100644
--- a/sphinx/themes/basic/localtoc.html
+++ b/sphinx/themes/basic/localtoc.html
@@ -8,6 +8,6 @@
     :license: BSD, see LICENSE for details.
 #}
 {%- if display_toc %}
-  <h3><a href="{{ pathto(master_doc) }}">{{ _('Table of Contents') }}</a></h3>
+  <h3><a href="{{ pathto(master_doc)|e }}">{{ _('Table of Contents') }}</a></h3>
   {{ toc }}
 {%- endif %}
diff --git a/sphinx/themes/haiku/layout.html b/sphinx/themes/haiku/layout.html
index 6dffe70df..f833cf509 100644
--- a/sphinx/themes/haiku/layout.html
+++ b/sphinx/themes/haiku/layout.html
@@ -21,7 +21,7 @@
         «&#160;&#160;<a href="{{ prev.link|e }}">{{ prev.title }}</a>
         &#160;&#160;::&#160;&#160;
         {%- endif %}
-        <a class="uplink" href="{{ pathto(master_doc) }}">{{ _('Contents') }}</a>
+        <a class="uplink" href="{{ pathto(master_doc)|e }}">{{ _('Contents') }}</a>
         {%- if next %}
         &#160;&#160;::&#160;&#160;
         <a href="{{ next.link|e }}">{{ next.title }}</a>&#160;&#160;»
diff --git a/sphinx/themes/pyramid/layout.html b/sphinx/themes/pyramid/layout.html
index 2f891158d..f1d3984dc 100644
--- a/sphinx/themes/pyramid/layout.html
+++ b/sphinx/themes/pyramid/layout.html
@@ -12,7 +12,7 @@
 {%- if logo %}
 <div class="header" role="banner">
   <div class="logo">
-    <a href="{{ pathto(master_doc) }}">
+    <a href="{{ pathto(master_doc)|e }}">
       <img class="logo" src="{{ pathto('_static/' + logo, 1) }}" alt="Logo"/>
     </a>
   </div>