diff --git a/lib/engines/content_block_manager/app/models/content_block_manager/content_block/document.rb b/lib/engines/content_block_manager/app/models/content_block_manager/content_block/document.rb
index afe2424b5d4..dd877073bb0 100644
--- a/lib/engines/content_block_manager/app/models/content_block_manager/content_block/document.rb
+++ b/lib/engines/content_block_manager/app/models/content_block_manager/content_block/document.rb
@@ -2,6 +2,7 @@ module ContentBlockManager
   module ContentBlock
     class Document < ApplicationRecord
       include Scopes::SearchableByKeyword
+      include Scopes::SearchableByLeadOrganisation
 
       extend FriendlyId
       friendly_id :title, use: :slugged, slug_column: :content_id_alias, routes: :default
diff --git a/lib/engines/content_block_manager/app/models/content_block_manager/content_block/document/scopes/searchable_by_lead_organisation.rb b/lib/engines/content_block_manager/app/models/content_block_manager/content_block/document/scopes/searchable_by_lead_organisation.rb
new file mode 100644
index 00000000000..6bc1cb1897d
--- /dev/null
+++ b/lib/engines/content_block_manager/app/models/content_block_manager/content_block/document/scopes/searchable_by_lead_organisation.rb
@@ -0,0 +1,12 @@
+module ContentBlockManager
+  module ContentBlock::Document::Scopes::SearchableByLeadOrganisation
+    extend ActiveSupport::Concern
+
+    included do
+      scope :with_lead_organisation,
+            lambda { |id|
+              joins(latest_edition: :edition_organisation).where("content_block_edition_organisations.organisation_id = :id", id:)
+            }
+    end
+  end
+end
diff --git a/lib/engines/content_block_manager/test/unit/app/models/content_block_edition/document/scopes/searchable_by_lead_organisation_test.rb b/lib/engines/content_block_manager/test/unit/app/models/content_block_edition/document/scopes/searchable_by_lead_organisation_test.rb
new file mode 100644
index 00000000000..3950b086423
--- /dev/null
+++ b/lib/engines/content_block_manager/test/unit/app/models/content_block_edition/document/scopes/searchable_by_lead_organisation_test.rb
@@ -0,0 +1,20 @@
+require "test_helper"
+
+class ContentBlockManager::SearchableByLeadOrganisationTest < ActiveSupport::TestCase
+  extend Minitest::Spec::DSL
+
+  describe ".with_lead_organisation" do
+    test "finds documents with lead organisation on latest edition" do
+      matching_organisation = create(:organisation, id: "1234")
+      document_with_org = create(:content_block_document, :email_address)
+      _edition_with_org = create(:content_block_edition,
+                                 :email_address,
+                                 document: document_with_org,
+                                 organisation: matching_organisation)
+      document_without_org = create(:content_block_document, :email_address)
+      _edition_without_org = create(:content_block_edition, :email_address, document: document_without_org)
+      _document_without_latest_edition = create(:content_block_document, :email_address)
+      assert_equal [document_with_org], ContentBlockManager::ContentBlock::Document.with_lead_organisation("1234")
+    end
+  end
+end