diff --git a/ckanext/googleanalytics/config.py b/ckanext/googleanalytics/config.py
index 3711479..929950b 100644
--- a/ckanext/googleanalytics/config.py
+++ b/ckanext/googleanalytics/config.py
@@ -32,7 +32,7 @@ def download_handler():
 
 
 def tracking_mode():
-    # type: () -> Literal["ga", "gtag"]
+    # type: () -> Literal["ga", "gtag", "gtm"]
     type_ = tk.config.get("googleanalytics.tracking_mode")
     if type_:
         return type_
@@ -45,6 +45,10 @@ def tracking_mode():
     if id_.startswith("G-"):
         return "gtag"
 
+    if id_.startswith("GTM-"):
+        return "gtm"
+
+
     return "ga"
 
 
diff --git a/ckanext/googleanalytics/helpers.py b/ckanext/googleanalytics/helpers.py
index 0754d99..52be647 100644
--- a/ckanext/googleanalytics/helpers.py
+++ b/ckanext/googleanalytics/helpers.py
@@ -6,6 +6,7 @@ from ckanext.googleanalytics import config
 def get_helpers():
     return {
         "googleanalytics_header": googleanalytics_header,
+        "googleanalytics_id": googleanalytics_id,
         "googleanalytics_resource_prefix": googleanalytics_resource_prefix,
         "googleanalytics_tracking_mode": googleanalytics_tracking_mode,
     }
@@ -43,3 +44,6 @@ def googleanalytics_header():
 
 def googleanalytics_tracking_mode():
     return config.tracking_mode()
+
+def googleanalytics_id():
+    return config.tracking_id()
diff --git a/ckanext/googleanalytics/templates/googleanalytics/snippets/_gtm.html b/ckanext/googleanalytics/templates/googleanalytics/snippets/_gtm.html
new file mode 100644
index 0000000..d74f7a9
--- /dev/null
+++ b/ckanext/googleanalytics/templates/googleanalytics/snippets/_gtm.html
@@ -0,0 +1,7 @@
+<!-- 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','{{googleanalytics_id}}');</script>
+<!-- End Google Tag Manager -->
diff --git a/ckanext/googleanalytics/templates/page.html b/ckanext/googleanalytics/templates/page.html
new file mode 100644
index 0000000..9278733
--- /dev/null
+++ b/ckanext/googleanalytics/templates/page.html
@@ -0,0 +1,16 @@
+{% ckan_extends %}
+
+{% block page %}
+    {% block googleanalytics_body_script %}
+        {% if h.googleanalytics_tracking_mode() == "gtm" %}
+            {% with id = h.googleanalytics_id() %}
+                <!-- Google Tag Manager (noscript) -->
+                <noscript><iframe src="https://www.googletagmanager.com/ns.html?id={{ id }}"
+                                  height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
+                <!-- End Google Tag Manager (noscript) -->
+            {% endwith %}
+        {% endif %}
+    {% endblock %}
+
+    {{ super() }}
+{% endblock page %}