diff --git a/_includes/layout/site-nav.html b/_includes/layout/site-nav.html
index da6ab851d8e..7db988722f1 100644
--- a/_includes/layout/site-nav.html
+++ b/_includes/layout/site-nav.html
@@ -1,3 +1,10 @@
+{% if site.environment == "public" %}
+<!-- Google Tag Manager (noscript) -->
+<noscript><iframe src="https://www.googletagmanager.com/ns.html?id={{ site.google.gtm }}"
+height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
+<!-- End Google Tag Manager (noscript) -->
+{% endif %}
+
 <nav class="site-nav">
 
   <div class="menu-btn">