diff --git a/src/fellchensammlung/templates/fellchensammlung/base.html b/src/fellchensammlung/templates/fellchensammlung/base.html
index 9b1bb8a..4e8a313 100644
--- a/src/fellchensammlung/templates/fellchensammlung/base.html
+++ b/src/fellchensammlung/templates/fellchensammlung/base.html
@@ -12,6 +12,7 @@
     {% block description %}{% endblock %}
     {% block og_description %}{% endblock %}
     {% block og_image %}{% endblock %}
+    <link rel="canonical" href="{% block canonical_url %}{% endblock %}">
 
     <!-- Add additional CSS in static file -->
     <link rel="stylesheet" href="{% static 'fellchensammlung/css/main.css' %}">
diff --git a/src/fellchensammlung/templates/fellchensammlung/details/detail-adoption-notice.html b/src/fellchensammlung/templates/fellchensammlung/details/detail-adoption-notice.html
index 8158f2f..e38eaac 100644
--- a/src/fellchensammlung/templates/fellchensammlung/details/detail-adoption-notice.html
+++ b/src/fellchensammlung/templates/fellchensammlung/details/detail-adoption-notice.html
@@ -13,6 +13,7 @@
 {% block og_description %}
     <meta name="og:description" content="{{ adoption_notice.description }}">
 {% endblock %}
+{% block canonical_url %}{{ host }}{% url 'adoption-notice-detail' adoption_notice_id=adoption_notice.id %}{% endblock %}
 
 {% block og_image %}
     {% if adoption_notice.get_photos %}
diff --git a/src/fellchensammlung/templates/fellchensammlung/index.html b/src/fellchensammlung/templates/fellchensammlung/index.html
index 61e431c..7b0b7b1 100644
--- a/src/fellchensammlung/templates/fellchensammlung/index.html
+++ b/src/fellchensammlung/templates/fellchensammlung/index.html
@@ -8,7 +8,7 @@
 {% block description %}<meta name="description" content="{% translate "notfellchen.org listet Farbratten in Tierheimen und Pflegestellen die ein Zuhause suchen. Adoptieren statt kaufen!" %}">{% endblock %}
 {% block og_description %}<meta name="og:description" content="{% translate "notfellchen.org listet Farbratten in Tierheimen und Pflegestellen die ein Zuhause suchen. Adoptieren statt kaufen!" %}">{% endblock %}
 {% block og_image %}<meta property="og:image" content="{% static 'fellchensammlung/img/link_preview.png' %}" />{% endblock %}
-
+{% block canonical_url %}{{ host }}{% url 'index' %}{% endblock %}
 
 {% block content %}
     {% for announcement in announcements %}
diff --git a/src/fellchensammlung/templatetags/custom_tags.py b/src/fellchensammlung/templatetags/custom_tags.py
index 4485e2b..29df759 100644
--- a/src/fellchensammlung/templatetags/custom_tags.py
+++ b/src/fellchensammlung/templatetags/custom_tags.py
@@ -108,3 +108,8 @@ def trust_level(level_string):
 @register.filter
 def dictkey(d, key):
     return d.get(key)
+
+
+@register.simple_tag
+def host():
+    return settings.host
diff --git a/src/notfellchen/settings.py b/src/notfellchen/settings.py
index 6e73114..88f54b0 100644
--- a/src/notfellchen/settings.py
+++ b/src/notfellchen/settings.py
@@ -141,6 +141,8 @@ STATIC_ROOT = config.get("locations", "static", fallback="/notfellchen/static")
 MEDIA_ROOT = config.get("locations", "media", fallback="/notfellchen/static")
 MEDIA_URL = config.get("urls", "media", fallback="/media/")
 
+# Host will be used for allowed hosts but also for canonical URLs and CSRF settings!
+# Take all three into account when modifying
 host = config.get("notfellchen", "host", fallback='*')
 
 # see https://docs.djangoproject.com/en/3.2/ref/settings/#std-setting-ALLOWED_HOSTS