diff --git a/sdk/monitor/azure-monitor-opentelemetry-exporter/CHANGELOG.md b/sdk/monitor/azure-monitor-opentelemetry-exporter/CHANGELOG.md
index ef92eac283c5..0088906b327e 100644
--- a/sdk/monitor/azure-monitor-opentelemetry-exporter/CHANGELOG.md
+++ b/sdk/monitor/azure-monitor-opentelemetry-exporter/CHANGELOG.md
@@ -10,6 +10,8 @@
     ([#34141](https://github.com/Azure/azure-sdk-for-python/pull/34141))
 - Add application.ver to part A fields
     ([#34401](https://github.com/Azure/azure-sdk-for-python/pull/34401))
+- Add `APPLICATIONINSIGHTS_METRIC_NAMESPACE_OPT_IN`
+    ([#34463](https://github.com/Azure/azure-sdk-for-python/pull/34463))
 
 ### Breaking Changes
 
diff --git a/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/_constants.py b/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/_constants.py
index 8fffcb3e424f..e66fac012d9e 100644
--- a/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/_constants.py
+++ b/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/_constants.py
@@ -9,6 +9,7 @@
 _APPLICATIONINSIGHTS_STATSBEAT_DISABLED_ALL = "APPLICATIONINSIGHTS_STATSBEAT_DISABLED_ALL"
 _APPLICATIONINSIGHTS_OPENTELEMETRY_RESOURCE_METRIC_DISABLED = \
     "APPLICATIONINSIGHTS_OPENTELEMETRY_RESOURCE_METRIC_DISABLED"
+_APPLICATIONINSIGHTS_METRIC_NAMESPACE_OPT_IN = "APPLICATIONINSIGHTS_METRIC_NAMESPACE_OPT_IN"
 _WEBSITE_SITE_NAME = "WEBSITE_SITE_NAME"
 _WEBSITE_HOME_STAMPNAME = "WEBSITE_HOME_STAMPNAME"
 _WEBSITE_HOSTNAME = "WEBSITE_HOSTNAME"
diff --git a/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/export/metrics/_exporter.py b/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/export/metrics/_exporter.py
index 859b85e48357..0485a20fb49a 100644
--- a/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/export/metrics/_exporter.py
+++ b/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/export/metrics/_exporter.py
@@ -1,6 +1,7 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License.
 import logging
+import os
 
 from typing import Dict, Optional, Union, Any
 
@@ -23,8 +24,10 @@
     NumberDataPoint,
 )
 from opentelemetry.sdk.resources import Resource
+from opentelemetry.sdk.util.instrumentation import InstrumentationScope
 
 from azure.monitor.opentelemetry.exporter._constants import (
+    _APPLICATIONINSIGHTS_METRIC_NAMESPACE_OPT_IN,
     _AUTOCOLLECTED_INSTRUMENT_NAMES,
     _METRIC_ENVELOPE_NAME,
 )
@@ -94,6 +97,7 @@ def export(
                                 point,
                                 metric.name,
                                 resource_metric.resource,
+                                scope_metric.scope,
                             )
                             if envelope is not None:
                                 envelopes.append(envelope)
@@ -133,8 +137,9 @@ def _point_to_envelope(
         point: DataPointT,
         name: str,
         resource: Optional[Resource] = None,
+        scope: Optional[InstrumentationScope] = None,
     ) -> Optional[TelemetryItem]:
-        envelope = _convert_point_to_envelope(point, name, resource)
+        envelope = _convert_point_to_envelope(point, name, resource, scope)
         if name in _AUTOCOLLECTED_INSTRUMENT_NAMES:
             envelope = _handle_std_metric_envelope(envelope, name, point.attributes) # type: ignore
         if envelope is not None:
@@ -168,10 +173,14 @@ def _convert_point_to_envelope(
     point: DataPointT,
     name: str,
     resource: Optional[Resource] = None,
+    scope: Optional[InstrumentationScope] = None
 ) -> TelemetryItem:
     envelope = _utils._create_telemetry_item(point.time_unix_nano)
     envelope.name = _METRIC_ENVELOPE_NAME
     envelope.tags.update(_utils._populate_part_a_fields(resource)) # type: ignore
+    namespace = None
+    if scope is not None and _is_metric_namespace_opted_in():
+        namespace = str(scope.name)[:256]
     value: Union[int, float] = 0
     count = 1
     min_ = None
@@ -191,6 +200,7 @@ def _convert_point_to_envelope(
 
     data_point = MetricDataPoint(
         name=str(name)[:1024],
+        namespace=namespace,
         value=value,
         count=count,
         min=min_,
@@ -266,6 +276,8 @@ def _handle_std_metric_envelope(
 def _is_status_code_success(status_code: Optional[str], threshold: int) -> bool:
     return status_code is not None and int(status_code) < threshold
 
+def _is_metric_namespace_opted_in() -> bool:
+    return os.environ.get(_APPLICATIONINSIGHTS_METRIC_NAMESPACE_OPT_IN, "False").lower() == "true"
 
 def _get_metric_export_result(result: ExportResult) -> MetricExportResult:
     if result == ExportResult.SUCCESS:
diff --git a/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/statsbeat/_exporter.py b/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/statsbeat/_exporter.py
index bde8c807389d..e711731f9ca6 100644
--- a/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/statsbeat/_exporter.py
+++ b/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/statsbeat/_exporter.py
@@ -3,6 +3,7 @@
 from typing import Optional
 from opentelemetry.sdk.metrics.export import DataPointT
 from opentelemetry.sdk.resources import Resource
+from opentelemetry.sdk.util.instrumentation import InstrumentationScope
 
 from azure.monitor.opentelemetry.exporter._generated.models import TelemetryItem
 from azure.monitor.opentelemetry.exporter import AzureMonitorMetricExporter
@@ -17,6 +18,7 @@ def _point_to_envelope(
         point: DataPointT,
         name: str,
         resource: Optional[Resource] = None,
+        scope: Optional[InstrumentationScope] = None
     ) -> Optional[TelemetryItem]:
         # map statsbeat name from OpenTelemetry name
         name = _STATSBEAT_METRIC_NAME_MAPPINGS[name]
@@ -24,4 +26,5 @@ def _point_to_envelope(
             point,
             name,
             resource,
+            None,
         )
diff --git a/sdk/monitor/azure-monitor-opentelemetry-exporter/tests/metrics/test_metrics.py b/sdk/monitor/azure-monitor-opentelemetry-exporter/tests/metrics/test_metrics.py
index 4869f9d300da..024c358e6b16 100644
--- a/sdk/monitor/azure-monitor-opentelemetry-exporter/tests/metrics/test_metrics.py
+++ b/sdk/monitor/azure-monitor-opentelemetry-exporter/tests/metrics/test_metrics.py
@@ -213,6 +213,7 @@ def test_point_to_envelope_partA_default(self):
     def test_point_to_envelope_number(self):
         exporter = self._exporter
         resource = Resource.create(attributes={"asd":"test_resource"})
+        scope = InstrumentationScope("test_scope")
         point=NumberDataPoint(
             attributes={
                 "test": "attribute",
@@ -221,7 +222,7 @@ def test_point_to_envelope_number(self):
             time_unix_nano=1646865018558419457,
             value=10,
         )
-        envelope = exporter._point_to_envelope(point, "test name", resource)
+        envelope = exporter._point_to_envelope(point, "test name", resource, scope)
         self.assertEqual(envelope.instrumentation_key, exporter._instrumentation_key)
         self.assertEqual(envelope.name, 'Microsoft.ApplicationInsights.Metric')
         self.assertEqual(envelope.time, ns_to_iso_str(point.time_unix_nano))
@@ -230,6 +231,7 @@ def test_point_to_envelope_number(self):
         self.assertEqual(envelope.data.base_data.properties['test'], 'attribute')
         self.assertEqual(len(envelope.data.base_data.metrics), 1)
         self.assertEqual(envelope.data.base_data.metrics[0].name, "test name")
+        self.assertEqual(envelope.data.base_data.metrics[0].namespace, None)
         self.assertEqual(envelope.data.base_data.metrics[0].value, 10)
         self.assertEqual(envelope.data.base_data.metrics[0].count, 1)
 
@@ -261,6 +263,37 @@ def test_point_to_envelope_histogram(self):
         self.assertEqual(envelope.data.base_data.metrics[0].value, 31)
         self.assertEqual(envelope.data.base_data.metrics[0].count, 7)
 
+    @mock.patch.dict(
+        "os.environ",
+        {
+            "APPLICATIONINSIGHTS_METRIC_NAMESPACE_OPT_IN": "True",
+        },
+    )
+    def test_point_to_envelope_metric_namespace(self):
+        exporter = self._exporter
+        resource = Resource.create(attributes={"asd":"test_resource"})
+        scope = InstrumentationScope("test_scope")
+        point=NumberDataPoint(
+            attributes={
+                "test": "attribute",
+            },
+            start_time_unix_nano=1646865018558419456,
+            time_unix_nano=1646865018558419457,
+            value=10,
+        )
+        envelope = exporter._point_to_envelope(point, "test name", resource, scope)
+        self.assertEqual(envelope.instrumentation_key, exporter._instrumentation_key)
+        self.assertEqual(envelope.name, 'Microsoft.ApplicationInsights.Metric')
+        self.assertEqual(envelope.time, ns_to_iso_str(point.time_unix_nano))
+        self.assertEqual(envelope.data.base_type, 'MetricData')
+        self.assertEqual(len(envelope.data.base_data.properties), 1)
+        self.assertEqual(envelope.data.base_data.properties['test'], 'attribute')
+        self.assertEqual(len(envelope.data.base_data.metrics), 1)
+        self.assertEqual(envelope.data.base_data.metrics[0].name, "test name")
+        self.assertEqual(envelope.data.base_data.metrics[0].namespace, "test_scope")
+        self.assertEqual(envelope.data.base_data.metrics[0].value, 10)
+        self.assertEqual(envelope.data.base_data.metrics[0].count, 1)
+
     def test_point_to_envelope_std_metric_client_duration(self):
         exporter = self._exporter
         resource = Resource(