diff --git a/jdav_web/members/admin.py b/jdav_web/members/admin.py
index c7971ed..c33caa8 100644
--- a/jdav_web/members/admin.py
+++ b/jdav_web/members/admin.py
@@ -240,7 +240,7 @@ class MemberAdmin(CommonAdminMixin, admin.ModelAdmin):
     }
     change_form_template = "members/change_member.html"
     ordering = ('lastname',)
-    actions = ['request_echo', 'invite_as_user_action']
+    actions = ['request_echo', 'invite_as_user_action', 'unconfirm']
     list_per_page = 25
 
     form = MemberAdminForm
@@ -409,6 +409,12 @@ class MemberAdmin(CommonAdminMixin, admin.ModelAdmin):
     name_text_or_link.short_description = _('Name')
     name_text_or_link.admin_order_field = 'lastname'
 
+    def unconfirm(self, request, queryset):
+        for member in queryset:
+            member.unconfirm()
+        messages.success(request, _("Successfully unconfirmed selected members."))
+    unconfirm.short_description = _('Unconfirm selected members.')
+
 
 class DemoteToWaiterForm(forms.Form):
     _selected_action = forms.CharField(widget=forms.MultipleHiddenInput)
diff --git a/jdav_web/members/locale/de/LC_MESSAGES/django.po b/jdav_web/members/locale/de/LC_MESSAGES/django.po
index 1876643..095088d 100644
--- a/jdav_web/members/locale/de/LC_MESSAGES/django.po
+++ b/jdav_web/members/locale/de/LC_MESSAGES/django.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2025-04-10 23:31+0200\n"
+"POT-Creation-Date: 2025-04-10 23:51+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -133,6 +133,15 @@ msgstr "Aktivität"
 msgid "Name"
 msgstr "Name"
 
+#: members/admin.py
+msgid "Successfully unconfirmed selected members."
+msgstr ""
+"Ausgewählte Teilnehmer*innen zu unbestätigten Registrierungen zurückgesetzt."
+
+#: members/admin.py
+msgid "Unconfirm selected members."
+msgstr "Ausgewählte Teilnehmer*innen zu unbestätigten Registrierungen zurücksetzen."
+
 #: members/admin.py members/tests.py
 msgid "Successfully requested mail confirmation from selected registrations."
 msgstr "Aufforderung zur Bestätigung der Email Adresse versendet."
diff --git a/jdav_web/members/models.py b/jdav_web/members/models.py
index dd617f2..8d99151 100644
--- a/jdav_web/members/models.py
+++ b/jdav_web/members/models.py
@@ -414,6 +414,10 @@ class Member(Person):
         self.save()
         return True
 
+    def unconfirm(self):
+        self.confirmed = False
+        self.save()
+
     def unsubscribe(self, key):
         if self.unsubscribe_key == key and timezone.now() <\
                 self.unsubscribe_expire: