diff --git a/CHANGELOG.md b/CHANGELOG.md
index f1df1453a187..cb0f67ad7bac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 IMPROVEMENTS:
 * api: use region from job hcl when not provided as query parameter in job registration and plan endpoints [[GH-5664](https://github.com/hashicorp/nomad/pull/5664)]
+* metrics: add namespace label as appropriate to metrics [[GH-5847](https://github.com/hashicorp/nomad/issues/5847)]
 
 BUG FIXES:
 
diff --git a/client/allocrunner/taskrunner/task_runner.go b/client/allocrunner/taskrunner/task_runner.go
index 352815654651..b71c3bd4df87 100644
--- a/client/allocrunner/taskrunner/task_runner.go
+++ b/client/allocrunner/taskrunner/task_runner.go
@@ -362,6 +362,10 @@ func (tr *TaskRunner) initLabels() {
 			Name:  "task",
 			Value: tr.taskName,
 		},
+		{
+			Name:  "namespace",
+			Value: tr.alloc.Namespace,
+		},
 	}
 
 	if tr.alloc.Job.ParentID != "" {
diff --git a/client/allocrunner/taskrunner/task_runner_test.go b/client/allocrunner/taskrunner/task_runner_test.go
index b3506d1b36c0..8a6ab8cf50cb 100644
--- a/client/allocrunner/taskrunner/task_runner_test.go
+++ b/client/allocrunner/taskrunner/task_runner_test.go
@@ -2021,3 +2021,34 @@ func testWaitForTaskToStart(t *testing.T, tr *TaskRunner) {
 		require.NoError(t, err)
 	})
 }
+
+// TestTaskRunner_BaseLabels tests that the base labels for the task metrics
+// are set appropriately.
+func TestTaskRunner_BaseLabels(t *testing.T) {
+	t.Parallel()
+	require := require.New(t)
+
+	alloc := mock.BatchAlloc()
+	alloc.Namespace = "not-default"
+	task := alloc.Job.TaskGroups[0].Tasks[0]
+	task.Driver = "raw_exec"
+	task.Config = map[string]interface{}{
+		"command": "whoami",
+	}
+
+	config, cleanup := testTaskRunnerConfig(t, alloc, task.Name)
+	defer cleanup()
+
+	tr, err := NewTaskRunner(config)
+	require.NoError(err)
+
+	labels := map[string]string{}
+	for _, e := range tr.baseLabels {
+		labels[e.Name] = e.Value
+	}
+	require.Equal(alloc.Job.Name, labels["job"])
+	require.Equal(alloc.TaskGroup, labels["task_group"])
+	require.Equal(task.Name, labels["task"])
+	require.Equal(alloc.ID, labels["alloc_id"])
+	require.Equal(alloc.Namespace, labels["namespace"])
+}
diff --git a/nomad/leader.go b/nomad/leader.go
index 6a27c78dd933..0b08fc60cc9d 100644
--- a/nomad/leader.go
+++ b/nomad/leader.go
@@ -657,6 +657,10 @@ func (s *Server) iterateJobSummaryMetrics(summary *structs.JobSummary) {
 					Name:  "task_group",
 					Value: name,
 				},
+				{
+					Name:  "namespace",
+					Value: summary.Namespace,
+				},
 			}
 
 			if strings.Contains(summary.JobID, "/dispatch-") {