diff --git a/app/services/imports/lettings_logs_import_service.rb b/app/services/imports/lettings_logs_import_service.rb
index b7e2673d0..138126cbb 100644
--- a/app/services/imports/lettings_logs_import_service.rb
+++ b/app/services/imports/lettings_logs_import_service.rb
@@ -253,8 +253,8 @@ module Imports
         user = LegacyUser.find_by(old_user_id: owner_id)&.user
         if user.blank?
           @logger.error("Lettings log '#{attributes['old_id']}' belongs to legacy user with owner-user-id: '#{owner_id}' which cannot be found. Assigning log to 'Unassigned' user.")
-          if User.find_by(name: "Unassigned")
-            user = User.find_by(name: "Unassigned")
+          if User.find_by(name: "Unassigned", organisation_id: attributes["managing_organisation_id"])
+            user = User.find_by(name: "Unassigned", organisation_id: attributes["managing_organisation_id"])
           else
             user = User.new(
               name: "Unassigned",
diff --git a/app/services/imports/sales_logs_import_service.rb b/app/services/imports/sales_logs_import_service.rb
index 8a8156480..ecee55c22 100644
--- a/app/services/imports/sales_logs_import_service.rb
+++ b/app/services/imports/sales_logs_import_service.rb
@@ -181,12 +181,12 @@ module Imports
 
         if user.blank?
           @logger.error("Sales log '#{attributes['old_id']}' belongs to legacy user with owner-user-id: '#{owner_id}' which cannot be found. Assigning log to 'Unassigned' user.")
-          if User.find_by(name: "Unassigned")
-            user = User.find_by(name: "Unassigned")
+          if User.find_by(name: "Unassigned", organisation_id: attributes["owning_organisation_id"])
+            user = User.find_by(name: "Unassigned", organisation_id: attributes["owning_organisation_id"])
           else
             user = User.new(
               name: "Unassigned",
-              organisation_id: attributes["managing_organisation_id"],
+              organisation_id: attributes["owning_organisation_id"],
               is_dpo: false,
               encrypted_password: SecureRandom.hex(10),
               email: SecureRandom.uuid,
diff --git a/spec/services/imports/lettings_logs_import_service_spec.rb b/spec/services/imports/lettings_logs_import_service_spec.rb
index 4b18da5f6..1025fcd3b 100644
--- a/spec/services/imports/lettings_logs_import_service_spec.rb
+++ b/spec/services/imports/lettings_logs_import_service_spec.rb
@@ -157,6 +157,19 @@ RSpec.describe Imports::LettingsLogsImportService do
           second_lettings_log = LettingsLog.where(old_id: "fake_id").first
           expect(lettings_log&.created_by).to eq(second_lettings_log&.created_by)
         end
+
+        context "when unassigned user exist for a different organisation" do
+          let!(:other_unassigned_user) { create(:user, name: "Unassigned") }
+
+          it "creates a new unassigned user for current organisation" do
+            expect(logger).to receive(:error).with("Lettings log '0ead17cb-1668-442d-898c-0d52879ff592' belongs to legacy user with owner-user-id: 'fake_id' which cannot be found. Assigning log to 'Unassigned' user.")
+            lettings_log_service.send(:create_log, lettings_log_xml)
+
+            lettings_log = LettingsLog.where(old_id: lettings_log_id).first
+            expect(lettings_log&.created_by&.name).to eq("Unassigned")
+            expect(lettings_log&.created_by).not_to eq(other_unassigned_user)
+          end
+        end
       end
 
       it "correctly sets imported at date" do
diff --git a/spec/services/imports/sales_logs_import_service_spec.rb b/spec/services/imports/sales_logs_import_service_spec.rb
index afe4f6750..bbabc5c1a 100644
--- a/spec/services/imports/sales_logs_import_service_spec.rb
+++ b/spec/services/imports/sales_logs_import_service_spec.rb
@@ -148,6 +148,19 @@ RSpec.describe Imports::SalesLogsImportService do
         second_sales_log = SalesLog.where(old_id: "fake_id").first
         expect(sales_log&.created_by).to eq(second_sales_log&.created_by)
       end
+
+      context "when unassigned user exist for a different organisation" do
+        let!(:other_unassigned_user) { create(:user, name: "Unassigned") }
+
+        it "creates a new unassigned user for current organisation" do
+          expect(logger).to receive(:error).with("Sales log 'shared_ownership_sales_log' belongs to legacy user with owner-user-id: 'fake_id' which cannot be found. Assigning log to 'Unassigned' user.")
+          sales_log_service.send(:create_log, sales_log_xml)
+
+          sales_log = SalesLog.where(old_id: sales_log_id).first
+          expect(sales_log&.created_by&.name).to eq("Unassigned")
+          expect(sales_log&.created_by).not_to eq(other_unassigned_user)
+        end
+      end
     end
 
     context "and the log startdate is before 22/23 collection period" do