diff --git a/_layouts/default.html b/_layouts/default.html
index 7a4390a..f7241f5 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -12,9 +12,19 @@
   <head>
     {% include head.html %}
     {% include head/custom.html %}
+    <!-- Google Tag Manager -->
+    <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=
+    'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+    })(window,document,'script','dataLayer','GTM-NLDCPG38');</script>
+    <!-- End Google Tag Manager -->
   </head>
 
   <body class="layout--{{ page.layout | default: layout.layout }}{% if page.classes or layout.classes %}{{ page.classes | default: layout.classes | join: ' ' | prepend: ' ' }}{% endif %}">
+    <!-- Google Tag Manager (noscript) -->
+    <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-NLDCPG38" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
+    <!-- End Google Tag Manager (noscript) -->
     {% include_cached skip-links.html %}
     {% include_cached masthead.html %}
 
