diff --git a/src/sentry/api/bases/organization_events.py b/src/sentry/api/bases/organization_events.py
index f06be16e9d616c..ee9302e6c304c4 100644
--- a/src/sentry/api/bases/organization_events.py
+++ b/src/sentry/api/bases/organization_events.py
@@ -25,6 +25,7 @@
 from sentry.discover.models import DatasetSourcesTypes, DiscoverSavedQueryTypes
 from sentry.exceptions import InvalidSearchQuery
 from sentry.models.dashboard_widget import DashboardWidgetTypes
+from sentry.models.dashboard_widget import DatasetSourcesTypes as DashboardDatasetSourcesTypes
 from sentry.models.group import Group
 from sentry.models.organization import Organization
 from sentry.models.project import Project
@@ -262,6 +263,7 @@ def save_split_decision(self, widget, has_errors, has_transactions_data):
             and widget.discover_widget_split != new_discover_widget_split
         ):
             widget.discover_widget_split = new_discover_widget_split
+            widget.dataset_source = DashboardDatasetSourcesTypes.INFERRED.value
             widget.save()
 
         return new_discover_widget_split
diff --git a/src/sentry/api/serializers/models/dashboard.py b/src/sentry/api/serializers/models/dashboard.py
index 52c90df7b8e580..11cf0daad313ca 100644
--- a/src/sentry/api/serializers/models/dashboard.py
+++ b/src/sentry/api/serializers/models/dashboard.py
@@ -5,6 +5,7 @@
 from sentry import features
 from sentry.api.serializers import Serializer, register, serialize
 from sentry.constants import ALL_ACCESS_PROJECTS
+from sentry.discover.models import DatasetSourcesTypes
 from sentry.models.dashboard import Dashboard
 from sentry.models.dashboard_widget import (
     DashboardWidget,
@@ -17,6 +18,8 @@
 from sentry.users.services.user.service import user_service
 from sentry.utils.dates import outside_retention_with_modified_start, parse_timestamp
 
+DATASET_SOURCES = dict(DatasetSourcesTypes.as_choices())
+
 
 @register(DashboardWidget)
 class DashboardWidgetSerializer(Serializer):
@@ -67,6 +70,7 @@ def serialize(self, obj, attrs, user, **kwargs):
             # Default to discover type if null
             "widgetType": widget_type,
             "layout": obj.detail.get("layout") if obj.detail else None,
+            "datasetSource": DATASET_SOURCES[obj.dataset_source],
         }
 
 
diff --git a/tests/sentry/api/endpoints/test_organization_dashboard_details.py b/tests/sentry/api/endpoints/test_organization_dashboard_details.py
index a41934ac2a75ce..0fb1d2cf1df8a2 100644
--- a/tests/sentry/api/endpoints/test_organization_dashboard_details.py
+++ b/tests/sentry/api/endpoints/test_organization_dashboard_details.py
@@ -6,6 +6,7 @@
 
 from django.urls import reverse
 
+from sentry.discover.models import DatasetSourcesTypes
 from sentry.models.dashboard import Dashboard, DashboardTombstone
 from sentry.models.dashboard_widget import (
     DashboardWidget,
@@ -262,6 +263,47 @@ def test_dashboard_widget_type_returns_split_decision(self):
         assert response.data["widgets"][1]["widgetType"] == "transaction-like"
         assert response.data["widgets"][2]["widgetType"] == "discover"
 
+    def test_dashboard_widget_returns_dataset_source(self):
+        dashboard = Dashboard.objects.create(
+            title="Dashboard With Dataset Source",
+            created_by_id=self.user.id,
+            organization=self.organization,
+        )
+        DashboardWidget.objects.create(
+            dashboard=dashboard,
+            order=0,
+            title="error widget",
+            display_type=DashboardWidgetDisplayTypes.LINE_CHART,
+            widget_type=DashboardWidgetTypes.DISCOVER,
+            interval="1d",
+            detail={"layout": {"x": 0, "y": 0, "w": 1, "h": 1, "minH": 2}},
+            dataset_source=DatasetSourcesTypes.INFERRED.value,
+        )
+
+        response = self.do_request("get", self.url(dashboard.id))
+        assert response.status_code == 200, response.content
+        assert response.data["widgets"][0]["datasetSource"] == "inferred"
+
+    def test_dashboard_widget_default_dataset_source_is_unknown(self):
+        dashboard = Dashboard.objects.create(
+            title="Dashboard Without",
+            created_by_id=self.user.id,
+            organization=self.organization,
+        )
+        DashboardWidget.objects.create(
+            dashboard=dashboard,
+            order=0,
+            title="error widget",
+            display_type=DashboardWidgetDisplayTypes.LINE_CHART,
+            widget_type=DashboardWidgetTypes.DISCOVER,
+            interval="1d",
+            detail={"layout": {"x": 0, "y": 0, "w": 1, "h": 1, "minH": 2}},
+        )
+
+        response = self.do_request("get", self.url(dashboard.id))
+        assert response.status_code == 200, response.content
+        assert response.data["widgets"][0]["datasetSource"] == "unknown"
+
 
 class OrganizationDashboardDetailsDeleteTest(OrganizationDashboardDetailsTestCase):
     def test_delete(self):
diff --git a/tests/snuba/api/endpoints/test_organization_events_mep.py b/tests/snuba/api/endpoints/test_organization_events_mep.py
index bee6706161c9db..398856c353d4aa 100644
--- a/tests/snuba/api/endpoints/test_organization_events_mep.py
+++ b/tests/snuba/api/endpoints/test_organization_events_mep.py
@@ -5,7 +5,7 @@
 from django.urls import reverse
 from rest_framework.response import Response
 
-from sentry.discover.models import TeamKeyTransaction
+from sentry.discover.models import DatasetSourcesTypes, TeamKeyTransaction
 from sentry.models.dashboard_widget import DashboardWidgetTypes
 from sentry.models.projectteam import ProjectTeam
 from sentry.models.transaction_threshold import (
@@ -3679,6 +3679,7 @@ def test_split_decision_for_errors_widget(self):
 
         widget.refresh_from_db()
         assert widget.discover_widget_split == DashboardWidgetTypes.ERROR_EVENTS
+        assert widget.dataset_source == DatasetSourcesTypes.INFERRED.value
 
     def test_split_decision_for_transactions_widget(self):
         transaction_data = load_data("transaction", timestamp=before_now(minutes=1))
@@ -3711,6 +3712,7 @@ def test_split_decision_for_transactions_widget(self):
 
         widget.refresh_from_db()
         assert widget.discover_widget_split == DashboardWidgetTypes.TRANSACTION_LIKE
+        assert widget.dataset_source == DatasetSourcesTypes.INFERRED.value
 
     def test_split_decision_for_ambiguous_widget_without_data(self):
         _, widget, __ = create_widget(
@@ -3736,6 +3738,7 @@ def test_split_decision_for_ambiguous_widget_without_data(self):
 
         widget.refresh_from_db()
         assert widget.discover_widget_split is None
+        assert widget.dataset_source == DatasetSourcesTypes.UNKNOWN.value
 
     def test_split_decision_for_ambiguous_widget_with_data(self):
         # Store a transaction