diff --git a/vortex-python/python/vortex/polars_.py b/vortex-python/python/vortex/polars_.py
index ff8df47fe9c..7fd0b240fef 100644
--- a/vortex-python/python/vortex/polars_.py
+++ b/vortex-python/python/vortex/polars_.py
@@ -172,6 +172,9 @@ def _polars_to_vortex(expr: dict[str, Any]) -> ve.Expr:
             if fn == "IsNotNull":
                 return ve.is_not_null(_inputs[0])
 
+            if fn == "IsNull":
+                return ve.is_null(_inputs[0])
+
             if "IsIn" in fn:
                 fn = fn["IsIn"]
                 if fn["nulls_equal"]:
diff --git a/vortex-python/test/test_polars_.py b/vortex-python/test/test_polars_.py
index 7d62722b38e..cf22a4fc900 100644
--- a/vortex-python/test/test_polars_.py
+++ b/vortex-python/test/test_polars_.py
@@ -182,3 +182,14 @@ def test_polars_binary_literals(tmp_path):
     actual = vx.open(str(path)).to_polars().filter(expr).collect()
     assert_frame_equal(actual, expected_frame)
     assert actual["id"].to_list() == [0]
+
+
+def test_polars_is_null(tmp_path):
+    frame = pl.DataFrame({"id": [0, 1, 2], "x": [1, None, 3]})
+    expr = pl.col("x").is_null()
+    path = tmp_path / "is_null.vortex"
+    vx.io.write(vx.array(frame.to_arrow()), str(path))
+    expected_frame = frame.lazy().filter(expr).collect()
+    actual = vx.open(str(path)).to_polars().filter(expr).collect()
+    assert_frame_equal(actual, expected_frame)
+    assert actual["id"].to_list() == [1]