diff --git a/observabilityclient/rbac.py b/observabilityclient/rbac.py
index 39741c4..a1e9887 100644
--- a/observabilityclient/rbac.py
+++ b/observabilityclient/rbac.py
@@ -18,10 +18,24 @@ from observabilityclient.utils.metric_utils import format_labels
 
 
 class PromQLRbac(object):
-    def __init__(self, prom_api_client, project_id):
+    def __init__(self, prom_api_client, project_id, project_label='project'):
         self.client = prom_api_client
+
+        # NOTE(jwysogla): Since Prometheus 3, metric and label names can
+        # utilize all unicode characters. But the syntax is a little different
+        # and some parts of the queries need to be quoted or escaped. The
+        # rest of this module doesn't support that right now, so use a
+        # Prometheus 2 regex and raise an exception when it doesn't match.
+        # See https://prometheus.io/docs/concepts/data_model/
+        label_name_regex = "[a-zA-Z_][a-zA-Z0-9_]*"
+        if not re.fullmatch(label_name_regex, project_label):
+            raise ValueError(
+                f"Project label {project_label} doesn't match the "
+                f"label name regex: {label_name_regex}"
+            )
+
         self.labels = {
-            "project": project_id
+            project_label: project_id
         }
 
     def _find_label_value_end(self, query, start, quote_char):
diff --git a/observabilityclient/tests/unit/test_rbac.py b/observabilityclient/tests/unit/test_rbac.py
index a5fb9e0..e6fb21f 100644
--- a/observabilityclient/tests/unit/test_rbac.py
+++ b/observabilityclient/tests/unit/test_rbac.py
@@ -192,3 +192,38 @@ class PromQLRbacTest(testtools.TestCase):
         expected = f"{query}{{project='{self.project_id}'}}"
         ret = self.rbac.append_rbac_labels(query)
         self.assertEqual(expected, ret)
+
+    def test_setting_different_project_label_name(self):
+        query = 'test_query'
+        project_label = 'different_name'
+        project_value = 'some_project'
+
+        rbac_instance = rbac.PromQLRbac(
+            mock.Mock(), project_value, project_label=project_label
+        )
+        rbac_instance.client.label_values = lambda label: [
+            query,
+        ]
+
+        expected = f"{query}{{{project_label}='{project_value}'}}"
+
+        ret = rbac_instance.modify_query(query)
+
+        self.assertEqual(expected, ret)
+
+    def test_setting_illegal_project_label_name(self):
+        # Try setting a label name with a white space character inside
+        project_label = 'different name'
+        project_value = 'some_project'
+
+        args = (mock.Mock(), project_value)
+        kwargs = {'project_label': project_label}
+
+        self.assertRaises(ValueError, rbac.PromQLRbac, *args, **kwargs)
+
+        # Try setting an empty label name
+        project_label = ''
+
+        kwargs = {'project_label': project_label}
+
+        self.assertRaises(ValueError, rbac.PromQLRbac, *args, **kwargs)
diff --git a/releasenotes/notes/allow-for-specifying-rbac-label-name-f99084757cde5f19.yaml b/releasenotes/notes/allow-for-specifying-rbac-label-name-f99084757cde5f19.yaml
new file mode 100644
index 0000000..1bce416
--- /dev/null
+++ b/releasenotes/notes/allow-for-specifying-rbac-label-name-f99084757cde5f19.yaml
@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Allow for specifying project label name when creating an instance
+    of PromQLRbac. The change is backwards compatible, the same label
+    name 'project' is still being used as a default.