diff --git a/src/backend/InvenTree/InvenTree/api_version.py b/src/backend/InvenTree/InvenTree/api_version.py
index e4602695e0..bf324d275c 100644
--- a/src/backend/InvenTree/InvenTree/api_version.py
+++ b/src/backend/InvenTree/InvenTree/api_version.py
@@ -1,11 +1,14 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 530
+INVENTREE_API_VERSION = 531
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 INVENTREE_API_TEXT = """
 
+v531 -> 2026-08-13 : https://github.com/inventree/InvenTree/pull/12635
+    - Adds "bulk update" support for the ReturnOrderLineItem API endpoint
+
 v530 -> 2026-07-28 : https://github.com/inventree/InvenTree/pull/12487
     - Adds searching against ReportSnippet API endpoint
 
diff --git a/src/backend/InvenTree/order/api.py b/src/backend/InvenTree/order/api.py
index d6b66ae4c4..9ca3108b85 100644
--- a/src/backend/InvenTree/order/api.py
+++ b/src/backend/InvenTree/order/api.py
@@ -1793,6 +1793,7 @@ class ReturnOrderLineItemOutputOptions(OutputConfiguration):
 
 class ReturnOrderLineItemList(
     ReturnOrderLineItemMixin,
+    BulkUpdateMixin,
     DataExportViewMixin,
     OutputOptionsMixin,
     ListCreateDestroyAPIView,
diff --git a/src/backend/InvenTree/order/test_api.py b/src/backend/InvenTree/order/test_api.py
index 83a90d50a3..893976cdb2 100644
--- a/src/backend/InvenTree/order/test_api.py
+++ b/src/backend/InvenTree/order/test_api.py
@@ -3716,6 +3716,42 @@ class ReturnOrderLineItemTests(InvenTreeAPITestCase):
 
         self.assertEqual(models.ReturnOrderLineItem.objects.count(), n - 1)
 
+    def test_bulk_update(self):
+        """Test that we can bulk update the 'outcome' field for multiple ReturnOrderLineItems via the API."""
+        ro = models.ReturnOrder.objects.get(pk=6)
+
+        # Create some extra line items against the same order, so we have multiple to update
+        models.ReturnOrderLineItem.objects.bulk_create([
+            models.ReturnOrderLineItem(order=ro, item_id=1006, quantity=1),
+            models.ReturnOrderLineItem(order=ro, item_id=1007, quantity=1),
+        ])
+
+        items = list(
+            models.ReturnOrderLineItem.objects.filter(order=ro).values_list(
+                'pk', flat=True
+            )
+        )
+
+        self.assertEqual(len(items), 3)
+
+        for line in models.ReturnOrderLineItem.objects.filter(pk__in=items):
+            self.assertEqual(line.outcome, ReturnOrderLineStatus.PENDING)
+
+        url = reverse('api-return-order-line-list')
+
+        data = {'items': items, 'outcome': ReturnOrderLineStatus.REPAIR.value}
+
+        # Update should fail without the correct role
+        self.patch(url, data, expected_code=403)
+
+        self.assignRole('return_order.change')
+
+        response = self.patch(url, data, expected_code=200).data
+        self.assertEqual(len(response['items']), 3)
+
+        for line in models.ReturnOrderLineItem.objects.filter(pk__in=items):
+            self.assertEqual(line.outcome, ReturnOrderLineStatus.REPAIR.value)
+
     def test_extra_line_bulk_delete(self):
         """Test that we can bulk delete multiple ReturnOrderExtraLine items via the API."""
         ro = models.ReturnOrder.objects.first()
diff --git a/src/frontend/src/tables/sales/ReturnOrderLineItemTable.tsx b/src/frontend/src/tables/sales/ReturnOrderLineItemTable.tsx
index 2f533067f3..918fe31955 100644
--- a/src/frontend/src/tables/sales/ReturnOrderLineItemTable.tsx
+++ b/src/frontend/src/tables/sales/ReturnOrderLineItemTable.tsx
@@ -1,5 +1,5 @@
 import { t } from '@lingui/core/macro';
-import { IconSquareArrowRight } from '@tabler/icons-react';
+import { IconFlag, IconSquareArrowRight } from '@tabler/icons-react';
 import { useCallback, useMemo, useState } from 'react';
 
 import { ActionButton } from '@lib/components/ActionButton';
@@ -16,6 +16,7 @@ import { apiUrl } from '@lib/functions/Api';
 import useTable from '@lib/hooks/UseTable';
 import type { TableFilter } from '@lib/types/Filters';
 import type { TableColumn } from '@lib/types/Tables';
+import { Alert } from '@mantine/core';
 import {
   DateColumn,
   DescriptionColumn,
@@ -37,6 +38,7 @@ import {
   useReturnOrderLineItemFields
 } from '../../forms/ReturnOrderForms';
 import {
+  useBulkEditApiFormModal,
   useCreateApiFormModal,
   useDeleteApiFormModal,
   useEditApiFormModal
@@ -110,6 +112,21 @@ export default function ReturnOrderLineItemTable({
     table: table
   });
 
+  const setOutcome = useBulkEditApiFormModal({
+    url: ApiEndpoints.return_order_line_list,
+    items: table.selectedIds,
+    title: t`Set Outcome`,
+    preFormContent: (
+      <Alert color='blue'>
+        {t`Adjust the outcome for the selected line items.`}
+      </Alert>
+    ),
+    fields: {
+      outcome: {}
+    },
+    onFormSuccess: table.refreshTable
+  });
+
   const tableColumns: TableColumn[] = useMemo(() => {
     return [
       LineItemColumn({}),
@@ -211,6 +228,16 @@ export default function ReturnOrderLineItemTable({
           receiveLineItems.open();
         }}
         disabled={table.selectedRecords.length == 0}
+      />,
+      <ActionButton
+        key='set-outcome'
+        tooltip={t`Set outcome for selected items`}
+        icon={<IconFlag />}
+        hidden={!editable || !user.hasChangeRole(UserRoles.return_order)}
+        onClick={() => {
+          setOutcome.open();
+        }}
+        disabled={table.selectedRecords.length == 0}
       />
     ];
   }, [user, editable, inProgress, orderId, table.selectedRecords]);
@@ -266,6 +293,7 @@ export default function ReturnOrderLineItemTable({
       {editLine.modal}
       {deleteLine.modal}
       {receiveLineItems.modal}
+      {setOutcome.modal}
       <InvenTreeTable
         url={apiUrl(ApiEndpoints.return_order_line_list)}
         tableState={table}
@@ -279,7 +307,7 @@ export default function ReturnOrderLineItemTable({
           },
           defaultSortColumn: 'line',
           enableSelection:
-            inProgress && user.hasChangeRole(UserRoles.return_order),
+            editable && user.hasChangeRole(UserRoles.return_order),
           enableBulkDelete:
             editable && user.hasDeleteRole(UserRoles.return_order),
           afterBulkDelete: orderDetailRefresh,