diff --git a/py/src/braintrust/framework2.py b/py/src/braintrust/framework2.py
index 4bda4dbb5..51fb23630 100644
--- a/py/src/braintrust/framework2.py
+++ b/py/src/braintrust/framework2.py
@@ -1,7 +1,7 @@
 import dataclasses
 import json
 from collections.abc import Callable, Mapping, Sequence
-from typing import Any, overload
+from typing import Any, cast, overload
 
 import slugify
 from braintrust.logger import _internal_get_global_state, api_conn, login
@@ -26,16 +26,19 @@ def __init__(self):
         self._cache: dict[Project, str] = {}
         self._name_cache: dict[str, str] = {}
 
-    def get_by_name(self, project_name: str) -> str:
+    def get_by_name(self, project_name: str, project_group_name: str | None = None) -> str:
         if project_name not in self._name_cache:
             state = _internal_get_global_state()
-            project = state.api_client().projects.post_project(body={"name": project_name, "org_name": state.org_name})
+            body: dict[str, Any] = {"name": project_name, "org_name": state.org_name}
+            if project_group_name is not None:
+                body["project_group_name"] = project_group_name
+            project = state.api_client().projects.post_project(body=cast(Any, body))
             self._name_cache[project_name] = project["id"]
         return self._name_cache[project_name]
 
     def get(self, project: "Project") -> str:
         if project not in self._cache:
-            self._cache[project] = self.get_by_name(project.name)
+            self._cache[project] = self.get_by_name(project.name, project.project_group_name)
         return self._cache[project]
 
 
@@ -607,8 +610,9 @@ def create(
 class Project:
     """A handle to a Braintrust project."""
 
-    def __init__(self, name: str):
+    def __init__(self, name: str, project_group_name: str | None = None):
         self.name = name
+        self.project_group_name = project_group_name
         self.tools = ToolBuilder(self)
         self.prompts = PromptBuilder(self)
         self.parameters = ParametersBuilder(self)
@@ -659,8 +663,13 @@ def publish(self):
 class ProjectBuilder:
     """Creates handles to Braintrust projects."""
 
-    def create(self, name: str) -> Project:
-        return Project(name)
+    def create(self, name: str, project_group_name: str | None = None) -> Project:
+        """Create a handle to a Braintrust project.
+
+        :param name: The name of the project.
+        :param project_group_name: (Optional) If specified, creates the project inside the project group with this name when the project does not already exist. Requires permission to create projects in that group.
+        """
+        return Project(name, project_group_name=project_group_name)
 
 
 projects = ProjectBuilder()
diff --git a/py/src/braintrust/test_framework2.py b/py/src/braintrust/test_framework2.py
index c49b6d796..aa7079da9 100644
--- a/py/src/braintrust/test_framework2.py
+++ b/py/src/braintrust/test_framework2.py
@@ -30,6 +30,38 @@ def test_project_id_cache_uses_generated_project_registration():
     mock_state.app_conn.assert_not_called()
 
 
+def test_project_id_cache_creates_the_project_in_its_project_group():
+    mock_state = MagicMock()
+    mock_state.org_name = "test-org"
+    mock_state.api_client.return_value.projects.post_project.return_value = {
+        "id": "generated-project-id",
+        "name": "test-project",
+    }
+    project = projects.create("test-project", project_group_name="my-group")
+    with patch("braintrust.logger._state", mock_state):
+        project_id = ProjectIdCache().get(project)
+
+    assert project_id == "generated-project-id"
+    mock_state.api_client.return_value.projects.post_project.assert_called_once_with(
+        body={"name": "test-project", "org_name": "test-org", "project_group_name": "my-group"}
+    )
+
+
+def test_project_id_cache_omits_project_group_name_when_unspecified():
+    mock_state = MagicMock()
+    mock_state.org_name = "test-org"
+    mock_state.api_client.return_value.projects.post_project.return_value = {
+        "id": "generated-project-id",
+        "name": "test-project",
+    }
+    with patch("braintrust.logger._state", mock_state):
+        ProjectIdCache().get(projects.create("test-project"))
+
+    mock_state.api_client.return_value.projects.post_project.assert_called_once_with(
+        body={"name": "test-project", "org_name": "test-org"}
+    )
+
+
 class TestCodeFunctionMetadata:
     """Tests for CodeFunction metadata support."""