diff --git a/sigal/templates/sigal.conf.py b/sigal/templates/sigal.conf.py
index a733ecc..de39bd0 100644
--- a/sigal/templates/sigal.conf.py
+++ b/sigal/templates/sigal.conf.py
@@ -171,6 +171,9 @@ ignore_files = []
 # Google Analytics tracking code (UA-xxxx-x)
 # google_analytics = ''
 
+# Google Tag Manager tracking code (GTM-xxxxxx)
+# google_tag_manager = ''
+
 # Piwik tracking
 # tracker_url must not contain trailing slash.
 # Example : {'tracker_url': 'http://stats.domain.com', 'site_id' : 2}
diff --git a/sigal/themes/colorbox/templates/base.html b/sigal/themes/colorbox/templates/base.html
index fe9d226..a2cf886 100644
--- a/sigal/themes/colorbox/templates/base.html
+++ b/sigal/themes/colorbox/templates/base.html
@@ -20,6 +20,7 @@
     {% endblock %}
   </head>
   <body>
+    {% include 'gtm.html' %}
     <div class="container">
       <div class="four columns">
         <div class="sidebar">
diff --git a/sigal/themes/default/templates/gtm.html b/sigal/themes/default/templates/gtm.html
new file mode 100644
index 0000000..f4f2c3c
--- /dev/null
+++ b/sigal/themes/default/templates/gtm.html
@@ -0,0 +1,11 @@
+{% if settings.google_tag_manager %}
+<!-- Google Tag Manager -->
+<noscript><iframe src="//www.googletagmanager.com/ns.html?id={{settings.google_tag_manager}}"
+height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
+<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
+new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
+j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
+'//www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+})(window,document,'script','dataLayer','{{settings.google_tag_manager}}');</script>
+<!-- End Google Tag Manager -->
+{% endif %}
diff --git a/sigal/themes/galleria/templates/index.html b/sigal/themes/galleria/templates/index.html
index 6046469..fddc642 100644
--- a/sigal/themes/galleria/templates/index.html
+++ b/sigal/themes/galleria/templates/index.html
@@ -29,6 +29,7 @@
     {% endif %}
   </head>
   <body>
+    {% include 'gtm.html' %}
     <div class="container">
       <header>
         <h1><a href="{{ album.index_url }}">{{ index_title }}</a></h1>
diff --git a/sigal/themes/photoswipe/templates/index.html b/sigal/themes/photoswipe/templates/index.html
index bc85964..cdf8bf6 100644
--- a/sigal/themes/photoswipe/templates/index.html
+++ b/sigal/themes/photoswipe/templates/index.html
@@ -16,6 +16,7 @@
     {% endblock %}
   </head>
   <body>
+  {% include 'gtm.html' %}
   <div class="container">
 	<h1><a href="{{ album.index_url }}">{{ index_title }}</a></h1>
 
