diff --git a/judge/admin/organization.py b/judge/admin/organization.py
index e94a2a2ee..1993df776 100644
--- a/judge/admin/organization.py
+++ b/judge/admin/organization.py
@@ -6,6 +6,7 @@
 from reversion.admin import VersionAdmin
 
 from judge.models import Organization
+from judge.utils.organization import rename_organization_contests
 from judge.widgets import AdminHeavySelect2MultipleWidget, AdminMartorWidget
 
 
@@ -63,6 +64,31 @@ def recalculate_points(self, request, queryset):
                                             '%d organizations have scores recalculated.',
                                             count) % count)
 
+    def save_model(self, request, obj, form, change):
+        if change and 'slug' in form.changed_data:
+            # Get the old slug before saving
+            old_org = Organization.objects.get(pk=obj.pk)
+            old_slug = old_org.slug
+            new_slug = obj.slug
+
+            # Save the organization first
+            super().save_model(request, obj, form, change)
+
+            # Rename contests with new prefix
+            renamed_count = rename_organization_contests(obj, old_slug, new_slug)
+
+            if renamed_count > 0:
+                self.message_user(
+                    request,
+                    ngettext(
+                        '%d contest has been renamed with the new organization prefix.',
+                        '%d contests have been renamed with the new organization prefix.',
+                        renamed_count,
+                    ) % renamed_count,
+                )
+        else:
+            super().save_model(request, obj, form, change)
+
 
 class OrganizationRequestAdmin(admin.ModelAdmin):
     list_display = ('username', 'organization', 'state', 'time')
diff --git a/judge/utils/organization.py b/judge/utils/organization.py
index d02b8e7b9..d33da05f7 100644
--- a/judge/utils/organization.py
+++ b/judge/utils/organization.py
@@ -8,3 +8,34 @@ def add_admin_to_group(form):
     g = Group.objects.get(name=settings.GROUP_PERMISSION_FOR_ORG_ADMIN)
     for admin in all_admins:
         admin.user.groups.add(g)
+
+
+def rename_organization_contests(organization, old_slug, new_slug):
+    from judge.models import Contest
+
+    # Generate old and new prefixes (alphanumeric characters only)
+    old_prefix = ''.join(x for x in old_slug.lower() if x.isalnum()) + '_'
+    new_prefix = ''.join(x for x in new_slug.lower() if x.isalnum()) + '_'
+
+    if old_prefix == new_prefix:
+        return 0
+
+    # Find all contests belonging to this organization that start with the old prefix
+    org_contests = Contest.objects.filter(
+        organizations=organization,
+        is_organization_private=True,
+        key__startswith=old_prefix,
+    )
+
+    renamed_count = 0
+    for contest in org_contests:
+        # Replace the old prefix with the new prefix
+        new_key = new_prefix + contest.key[len(old_prefix):]
+
+        # Check if the new key already exists
+        if not Contest.objects.filter(key=new_key).exists():
+            contest.key = new_key
+            contest.save()
+            renamed_count += 1
+
+    return renamed_count