diff --git a/experimenter/experimenter/experiments/models.py b/experimenter/experimenter/experiments/models.py
index 6e75a062fd..c10434c4b6 100644
--- a/experimenter/experimenter/experiments/models.py
+++ b/experimenter/experimenter/experiments/models.py
@@ -730,6 +730,28 @@ def should_show_remote_settings_pending(self, reviewer):
             self.PublishStatus.WAITING,
         ) and self.can_review(reviewer)
 
+    @property
+    def rejection_block(self):
+        rejection = self.changes.latest_rejection()
+        if not rejection:
+            return None
+
+        flow_key = None
+        if rejection.old_status == self.Status.DRAFT:
+            flow_key = "LAUNCH_EXPERIMENT"
+        elif rejection.old_status == self.Status.LIVE:
+            if rejection.old_status_next == self.Status.LIVE:
+                flow_key = "END_ENROLLMENT"
+            else:
+                flow_key = "END_EXPERIMENT"
+
+        return {
+            "action": NimbusUIConstants.REVIEW_REQUEST_MESSAGES[flow_key],
+            "email": rejection.changed_by.email,
+            "date": rejection.changed_on,
+            "message": rejection.message,
+        }
+
     def review_messages(self):
         if self.status_next == self.Status.COMPLETE:
             return NimbusUIConstants.REVIEW_REQUEST_MESSAGES["END_EXPERIMENT"]
diff --git a/experimenter/experimenter/experiments/tests/test_models.py b/experimenter/experimenter/experiments/tests/test_models.py
index 2a8296a5a6..14ba5db56d 100644
--- a/experimenter/experimenter/experiments/tests/test_models.py
+++ b/experimenter/experimenter/experiments/tests/test_models.py
@@ -3758,6 +3758,57 @@ def test_review_messages_and_action_type(self, lifecycle, expected_message):
         experiment = NimbusExperimentFactory.create_with_lifecycle(lifecycle)
         self.assertEqual(experiment.review_messages(), expected_message)
 
+    @parameterized.expand(
+        [
+            (
+                NimbusExperiment.Status.DRAFT,
+                None,
+                "LAUNCH_EXPERIMENT",
+            ),
+            (
+                NimbusExperiment.Status.LIVE,
+                NimbusExperiment.Status.LIVE,
+                "END_ENROLLMENT",
+            ),
+            (
+                NimbusExperiment.Status.LIVE,
+                NimbusExperiment.Status.COMPLETE,
+                "END_EXPERIMENT",
+            ),
+        ]
+    )
+    def test_rejection_block_from_rejection_changelog(
+        self,
+        status,
+        status_next,
+        expected_flow_key,
+    ):
+        experiment = NimbusExperimentFactory.create_with_lifecycle(
+            NimbusExperimentFactory.Lifecycles.CREATED
+        )
+
+        experiment.status = status
+        experiment.status_next = status_next
+
+        for publish_status in (
+            NimbusExperiment.PublishStatus.REVIEW,
+            NimbusExperiment.PublishStatus.IDLE,
+        ):
+            experiment.publish_status = publish_status
+            experiment.save()
+            generate_nimbus_changelog(experiment, experiment.owner, "test message")
+
+        block = experiment.rejection_block
+        self.assertIsNotNone(block)
+        self.assertEqual(
+            block["action"], NimbusUIConstants.REVIEW_REQUEST_MESSAGES[expected_flow_key]
+        )
+        self.assertEqual(
+            block["email"], experiment.changes.latest_rejection().changed_by.email
+        )
+        self.assertEqual(block["date"], experiment.changes.latest_rejection().changed_on)
+        self.assertEqual(block["message"], "test message")
+
 
 class TestNimbusBranch(TestCase):
     def test_str(self):
diff --git a/experimenter/experimenter/nimbus_ui_new/forms.py b/experimenter/experimenter/nimbus_ui_new/forms.py
index 25c9736d44..e9ef02a7ea 100644
--- a/experimenter/experimenter/nimbus_ui_new/forms.py
+++ b/experimenter/experimenter/nimbus_ui_new/forms.py
@@ -955,9 +955,21 @@ class ReviewToDraftForm(UpdateStatusForm):
     status = NimbusExperiment.Status.DRAFT
     status_next = NimbusExperiment.Status.DRAFT
     publish_status = NimbusExperiment.PublishStatus.IDLE
+    changelog_message = forms.CharField(
+        required=False, label="Changelog Message", max_length=1000
+    )
+
+    cancel_message = forms.CharField(
+        required=False, label="Cancel Message", max_length=1000
+    )
 
     def get_changelog_message(self):
-        return f"{self.request.user} cancelled the review"
+        if self.cleaned_data.get("changelog_message"):
+            return (
+                f"{self.request.user} rejected the review with reason: "
+                f"{self.cleaned_data['changelog_message']}"
+            )
+        return f"{self.request.user} {self.cleaned_data['cancel_message']}"
 
 
 class ReviewToApproveForm(UpdateStatusForm):
diff --git a/experimenter/experimenter/nimbus_ui_new/templates/nimbus_experiments/launch_controls.html b/experimenter/experimenter/nimbus_ui_new/templates/nimbus_experiments/launch_controls.html
index f94434ea6a..9e03fc8902 100644
--- a/experimenter/experimenter/nimbus_ui_new/templates/nimbus_experiments/launch_controls.html
+++ b/experimenter/experimenter/nimbus_ui_new/templates/nimbus_experiments/launch_controls.html
@@ -1,6 +1,21 @@
 {% load nimbus_extras %}
 
 <div id="launch-controls">
+  {% with rejection=experiment.rejection_block %}
+    {% if rejection %}
+      <div class="alert alert-warning"
+           id="rejection-reason"
+           data-testid="rejection-notice">
+        <div class="text-body">
+          <p class="mb-2">
+            The request to {{ rejection.action }} was <strong>Rejected</strong> due to:
+          </p>
+          <p class="mb-2">{{ rejection.email }} on {{ rejection.date|date:"F j, Y" }}:</p>
+          <p class="bg-white rounded border p-2 mb-0">{{ rejection.message }}</p>
+        </div>
+      </div>
+    {% endif %}
+  {% endwith %}
   <form>
     {% csrf_token %}
     <!-- Draft Mode Controls -->
diff --git a/experimenter/experimenter/nimbus_ui_new/tests/test_forms.py b/experimenter/experimenter/nimbus_ui_new/tests/test_forms.py
index ccb89ec8ea..5ba665a83c 100644
--- a/experimenter/experimenter/nimbus_ui_new/tests/test_forms.py
+++ b/experimenter/experimenter/nimbus_ui_new/tests/test_forms.py
@@ -672,13 +672,41 @@ def test_preview_to_draft_form(self):
         self.assertIn("moved the experiment back to Draft", changelog.message)
         self.mock_preview_task.assert_called_once_with(countdown=5)
 
-    def test_review_to_draft_form(self):
+    def test_review_to_draft_form_with_changelog_message(self):
         self.experiment.status = NimbusExperiment.Status.DRAFT
         self.experiment.status_next = NimbusExperiment.Status.LIVE
         self.experiment.publish_status = NimbusExperiment.PublishStatus.REVIEW
         self.experiment.save()
 
-        form = ReviewToDraftForm(data={}, instance=self.experiment, request=self.request)
+        form = ReviewToDraftForm(
+            data={"changelog_message": "Needs further updates."},
+            instance=self.experiment,
+            request=self.request,
+        )
+        self.assertTrue(form.is_valid(), form.errors)
+
+        experiment = form.save()
+        self.assertEqual(experiment.status, NimbusExperiment.Status.DRAFT)
+        self.assertEqual(experiment.status_next, NimbusExperiment.Status.DRAFT)
+        self.assertEqual(experiment.publish_status, NimbusExperiment.PublishStatus.IDLE)
+
+        changelog = experiment.changes.latest("changed_on")
+        self.assertEqual(changelog.changed_by, self.user)
+        self.assertIn(
+            "rejected the review with reason: Needs further updates.", changelog.message
+        )
+
+    def test_review_to_draft_form_with_cancel_message(self):
+        self.experiment.status = NimbusExperiment.Status.DRAFT
+        self.experiment.status_next = NimbusExperiment.Status.LIVE
+        self.experiment.publish_status = NimbusExperiment.PublishStatus.REVIEW
+        self.experiment.save()
+
+        form = ReviewToDraftForm(
+            data={"cancel_message": "Review was withdrawn by the user."},
+            instance=self.experiment,
+            request=self.request,
+        )
         self.assertTrue(form.is_valid(), form.errors)
 
         experiment = form.save()
@@ -688,7 +716,7 @@ def test_review_to_draft_form(self):
 
         changelog = experiment.changes.latest("changed_on")
         self.assertEqual(changelog.changed_by, self.user)
-        self.assertIn("cancelled the review", changelog.message)
+        self.assertIn(f"{self.user} Review was withdrawn by the user.", changelog.message)
 
     def test_review_to_approve_form(self):
         self.experiment.status = NimbusExperiment.Status.DRAFT