diff --git a/roboflow/adapters/rfapi.py b/roboflow/adapters/rfapi.py
index 328332f1..5562aa22 100644
--- a/roboflow/adapters/rfapi.py
+++ b/roboflow/adapters/rfapi.py
@@ -763,6 +763,28 @@ def delete_folder(api_key, workspace_url, group_id):
     return response.json()
 
 
+def add_projects_to_folder(api_key, workspace_url, group_id, project_ids):
+    """PATCH /{ws}/groups/{id}/projects — add projects to a folder."""
+    response = requests.patch(
+        f"{API_URL}/{workspace_url}/groups/{group_id}/projects",
+        params={"api_key": api_key},
+        json={"projects": project_ids},
+    )
+    if response.status_code not in (200, 204):
+        raise RoboflowError(response.text)
+
+
+def remove_projects_from_folder(api_key, workspace_url, group_id, project_ids):
+    """DELETE /{ws}/groups/{id}/projects — remove projects from a folder."""
+    response = requests.delete(
+        f"{API_URL}/{workspace_url}/groups/{group_id}/projects",
+        params={"api_key": api_key},
+        json={"projects": project_ids},
+    )
+    if response.status_code not in (200, 204):
+        raise RoboflowError(response.text)
+
+
 # ---------------------------------------------------------------------------
 # Phase 2: Workflow endpoints
 # ---------------------------------------------------------------------------
diff --git a/roboflow/cli/handlers/folder.py b/roboflow/cli/handlers/folder.py
index 05028814..822ae294 100644
--- a/roboflow/cli/handlers/folder.py
+++ b/roboflow/cli/handlers/folder.py
@@ -61,6 +61,28 @@ def delete_folder(
     _delete_folder(args)
 
 
+@folder_app.command("add-projects")
+def add_projects(
+    ctx: typer.Context,
+    folder_id: Annotated[str, typer.Argument(help="Folder ID")],
+    projects: Annotated[str, typer.Argument(help="Comma-separated project IDs")],
+) -> None:
+    """Add projects to a folder."""
+    args = ctx_to_args(ctx, folder_id=folder_id, projects=projects)
+    _add_projects(args)
+
+
+@folder_app.command("remove-projects")
+def remove_projects(
+    ctx: typer.Context,
+    folder_id: Annotated[str, typer.Argument(help="Folder ID")],
+    projects: Annotated[str, typer.Argument(help="Comma-separated project IDs")],
+) -> None:
+    """Remove projects from a folder."""
+    args = ctx_to_args(ctx, folder_id=folder_id, projects=projects)
+    _remove_projects(args)
+
+
 # ---------------------------------------------------------------------------
 # Business logic (unchanged from argparse version)
 # ---------------------------------------------------------------------------
@@ -200,3 +222,51 @@ def _delete_folder(args) -> None:  # noqa: ANN001
 
     data = {"status": "deleted"}
     output(args, data, text=f"Deleted folder '{args.folder_id}'")
+
+
+def _add_projects(args) -> None:  # noqa: ANN001
+    import roboflow
+    from roboflow.cli._output import output, output_error, suppress_sdk_output
+
+    with suppress_sdk_output(args):
+        try:
+            rf = roboflow.Roboflow(api_key=args.api_key)
+            workspace = rf.workspace(args.workspace)
+        except Exception as exc:
+            output_error(args, str(exc))
+            return
+
+    project_ids = [p.strip() for p in args.projects.split(",")]
+
+    try:
+        workspace.add_projects_to_folder(args.folder_id, project_ids)
+    except Exception as exc:
+        output_error(args, str(exc), exit_code=1)
+        return
+
+    data = {"status": "added", "folder_id": args.folder_id, "projects": project_ids}
+    output(args, data, text=f"Added {len(project_ids)} project(s) to folder '{args.folder_id}'")
+
+
+def _remove_projects(args) -> None:  # noqa: ANN001
+    import roboflow
+    from roboflow.cli._output import output, output_error, suppress_sdk_output
+
+    with suppress_sdk_output(args):
+        try:
+            rf = roboflow.Roboflow(api_key=args.api_key)
+            workspace = rf.workspace(args.workspace)
+        except Exception as exc:
+            output_error(args, str(exc))
+            return
+
+    project_ids = [p.strip() for p in args.projects.split(",")]
+
+    try:
+        workspace.remove_projects_from_folder(args.folder_id, project_ids)
+    except Exception as exc:
+        output_error(args, str(exc), exit_code=1)
+        return
+
+    data = {"status": "removed", "folder_id": args.folder_id, "projects": project_ids}
+    output(args, data, text=f"Removed {len(project_ids)} project(s) from folder '{args.folder_id}'")
diff --git a/roboflow/core/workspace.py b/roboflow/core/workspace.py
index f25292e3..0206ad5f 100644
--- a/roboflow/core/workspace.py
+++ b/roboflow/core/workspace.py
@@ -1081,6 +1081,18 @@ def create_folder(self, name, parent_id=None, project_ids=None):
 
         return rfapi.create_folder(self.__api_key, self.url, name, parent_id=parent_id, project_ids=project_ids)
 
+    def add_projects_to_folder(self, group_id, project_ids):
+        """Add projects to an existing folder."""
+        from roboflow.adapters import rfapi
+
+        return rfapi.add_projects_to_folder(self.__api_key, self.url, group_id, project_ids)
+
+    def remove_projects_from_folder(self, group_id, project_ids):
+        """Remove projects from a folder."""
+        from roboflow.adapters import rfapi
+
+        return rfapi.remove_projects_from_folder(self.__api_key, self.url, group_id, project_ids)
+
     # -----------------------------------------------------------------
     # Phase 2: Workflow management
     # -----------------------------------------------------------------