diff --git a/rt_utils/rtstruct.py b/rt_utils/rtstruct.py
index 3e22ccc..58673c5 100644
--- a/rt_utils/rtstruct.py
+++ b/rt_utils/rtstruct.py
@@ -104,9 +104,10 @@ def get_roi_mask_by_name(self, name) -> np.ndarray:
         """
         Returns the 3D binary mask of the ROI with the given input name
         """
+        name = name.casefold() if type(name) is str else name
 
         for structure_roi in self.ds.StructureSetROISequence:
-            if structure_roi.ROIName == name:
+            if structure_roi.ROIName.casefold() == name:
                 contour_sequence = ds_helper.get_contour_sequence_by_roi_number(
                     self.ds, structure_roi.ROINumber
                 )
diff --git a/tests/test_rtstruct_builder.py b/tests/test_rtstruct_builder.py
index c5947cf..34ba5b9 100644
--- a/tests/test_rtstruct_builder.py
+++ b/tests/test_rtstruct_builder.py
@@ -72,6 +72,25 @@ def test_add_valid_roi(new_rtstruct: RTStruct):
     assert new_rtstruct.get_roi_names() == [NAME]
 
 
+def test_get_roi_by_name_case_insensitive(new_rtstruct: RTStruct):
+    NAME = "Test ROI"
+    mask = get_empty_mask(new_rtstruct)
+    mask[50:100, 50:100, 0] = 1
+    new_rtstruct.add_roi(mask, name=NAME)
+
+    assert type(new_rtstruct.get_roi_mask_by_name(name=NAME.upper())) is np.ndarray
+
+
+def test_get_invalid_roi_by_none_name(new_rtstruct: RTStruct):
+    NAME = "Test ROI"
+    mask = get_empty_mask(new_rtstruct)
+    mask[50:100, 50:100, 0] = 1
+    new_rtstruct.add_roi(mask, name=NAME)
+
+    with pytest.raises(RTStruct.ROIException):
+        new_rtstruct.get_roi_mask_by_name(name=None)
+
+
 def test_get_invalid_roi_mask_by_name(new_rtstruct: RTStruct):
     assert new_rtstruct.get_roi_names() == []
     with pytest.raises(RTStruct.ROIException):