diff --git a/daft/datatype.py b/daft/datatype.py
index c9e32c2d59..5dae6d7316 100644
--- a/daft/datatype.py
+++ b/daft/datatype.py
@@ -4,6 +4,7 @@
 
 import pyarrow as pa
 
+from daft.context import get_context
 from daft.daft import PyDataType
 
 _RAY_DATA_EXTENSIONS_AVAILABLE = True
@@ -178,6 +179,12 @@ def from_arrow_type(cls, arrow_type: pa.lib.DataType) -> DataType:
                 f"used in non-Python Arrow implementations and Daft uses the Rust Arrow2 implementation: {arrow_type}"
             )
         elif isinstance(arrow_type, pa.BaseExtensionType):
+            if get_context().runner_config.name == "ray":
+                raise ValueError(
+                    f"pyarrow extension types are not supported for the Ray runner: {arrow_type}. If you need support "
+                    "for this, please let us know on this issue: "
+                    "https://github.com/Eventual-Inc/Daft/issues/933"
+                )
             name = arrow_type.extension_name
             try:
                 metadata = arrow_type.__arrow_ext_serialize__().decode()
diff --git a/tests/dataframe/test_creation.py b/tests/dataframe/test_creation.py
index 6942cbb4d4..ff09560e39 100644
--- a/tests/dataframe/test_creation.py
+++ b/tests/dataframe/test_creation.py
@@ -15,6 +15,7 @@
 
 import daft
 from daft.api_annotations import APITypeError
+from daft.context import get_context
 from daft.dataframe import DataFrame
 from daft.datatype import DataType
 from tests.conftest import UuidType
@@ -173,6 +174,10 @@ def test_create_dataframe_arrow_tensor_ray(valid_data: list[dict[str, float]]) -
     ARROW_VERSION < (12, 0, 0),
     reason=f"Arrow version {ARROW_VERSION} doesn't support the canonical tensor extension type.",
 )
+@pytest.mark.skipif(
+    get_context().runner_config.name == "ray",
+    reason="Pickling canonical tensor extension type is not supported by pyarrow",
+)
 def test_create_dataframe_arrow_tensor_canonical(valid_data: list[dict[str, float]]) -> None:
     pydict = {k: [item[k] for item in valid_data] for k in valid_data[0].keys()}
     dtype = pa.fixed_shape_tensor(pa.int64(), (2, 2))
@@ -191,6 +196,10 @@ def test_create_dataframe_arrow_tensor_canonical(valid_data: list[dict[str, floa
     assert df.to_arrow() == expected
 
 
+@pytest.mark.skipif(
+    get_context().runner_config.name == "ray",
+    reason="pyarrow extension types aren't supported on Ray clusters.",
+)
 def test_create_dataframe_arrow_extension_type(valid_data: list[dict[str, float]], uuid_ext_type: UuidType) -> None:
     pydict = {k: [item[k] for item in valid_data] for k in valid_data[0].keys()}
     storage = pa.array([f"{i}".encode() for i in range(len(valid_data))])
@@ -207,6 +216,22 @@ def test_create_dataframe_arrow_extension_type(valid_data: list[dict[str, float]
     assert df.to_arrow() == expected
 
 
+# TODO(Clark): Remove this test once pyarrow extension types are supported for Ray clusters.
+@pytest.mark.skipif(
+    get_context().runner_config.name != "ray",
+    reason="This test requires the Ray runner.",
+)
+def test_create_dataframe_arrow_extension_type_fails_for_ray(
+    valid_data: list[dict[str, float]], uuid_ext_type: UuidType
+) -> None:
+    pydict = {k: [item[k] for item in valid_data] for k in valid_data[0].keys()}
+    storage = pa.array([f"{i}".encode() for i in range(len(valid_data))])
+    pydict["obj"] = pa.ExtensionArray.from_storage(uuid_ext_type, storage)
+    t = pa.Table.from_pydict(pydict)
+    with pytest.raises(ValueError):
+        daft.from_arrow(t).to_arrow()
+
+
 class PyExtType(pa.PyExtensionType):
     def __init__(self):
         pa.PyExtensionType.__init__(self, pa.binary())
diff --git a/tests/series/test_concat.py b/tests/series/test_concat.py
index 80a59fa25a..b66e40c656 100644
--- a/tests/series/test_concat.py
+++ b/tests/series/test_concat.py
@@ -8,6 +8,7 @@
 from ray.data.extensions import ArrowTensorArray
 
 from daft import DataType, Series
+from daft.context import get_context
 from tests.conftest import *
 from tests.series import ARROW_FLOAT_TYPES, ARROW_INT_TYPES, ARROW_STRING_TYPES
 
@@ -115,6 +116,10 @@ def test_series_concat_tensor_array_ray(chunks) -> None:
     ARROW_VERSION < (12, 0, 0),
     reason=f"Arrow version {ARROW_VERSION} doesn't support the canonical tensor extension type.",
 )
+@pytest.mark.skipif(
+    get_context().runner_config.name == "ray",
+    reason="Pickling canonical tensor extension type is not supported by pyarrow",
+)
 @pytest.mark.parametrize("chunks", [1, 2, 3, 10])
 def test_series_concat_tensor_array_canonical(chunks) -> None:
     element_shape = (2, 2)
@@ -141,6 +146,10 @@ def test_series_concat_tensor_array_canonical(chunks) -> None:
     np.testing.assert_equal(concated_arrow.to_numpy_ndarray(), expected)
 
 
+@pytest.mark.skipif(
+    get_context().runner_config.name == "ray",
+    reason="pyarrow extension types aren't supported on Ray clusters.",
+)
 @pytest.mark.parametrize("chunks", [1, 2, 3, 10])
 def test_series_concat_extension_type(uuid_ext_type, chunks) -> None:
     chunk_size = 3
diff --git a/tests/series/test_filter.py b/tests/series/test_filter.py
index 6ec0c174d4..6d3f264d06 100644
--- a/tests/series/test_filter.py
+++ b/tests/series/test_filter.py
@@ -4,6 +4,7 @@
 import pyarrow as pa
 import pytest
 
+from daft.context import get_context
 from daft.datatype import DataType
 from daft.series import Series
 from tests.series import ARROW_FLOAT_TYPES, ARROW_INT_TYPES, ARROW_STRING_TYPES
@@ -132,6 +133,10 @@ def test_series_filter_on_extension_array(uuid_ext_type) -> None:
     ARROW_VERSION < (12, 0, 0),
     reason=f"Arrow version {ARROW_VERSION} doesn't support the canonical tensor extension type.",
 )
+@pytest.mark.skipif(
+    get_context().runner_config.name == "ray",
+    reason="Pickling canonical tensor extension type is not supported by pyarrow",
+)
 def test_series_filter_on_canonical_tensor_extension_array() -> None:
     arr = np.arange(20).reshape((5, 2, 2))
     data = pa.FixedShapeTensorArray.from_numpy_ndarray(arr)
diff --git a/tests/series/test_if_else.py b/tests/series/test_if_else.py
index ac23b8c6db..2974428d49 100644
--- a/tests/series/test_if_else.py
+++ b/tests/series/test_if_else.py
@@ -5,6 +5,7 @@
 import pytest
 
 from daft import Series
+from daft.context import get_context
 from daft.datatype import DataType
 
 ARROW_VERSION = tuple(int(s) for s in pa.__version__.split(".") if s.isnumeric())
@@ -296,6 +297,10 @@ def test_series_if_else_struct(if_true, if_false, expected) -> None:
     assert result.to_pylist() == expected
 
 
+@pytest.mark.skipif(
+    get_context().runner_config.name == "ray",
+    reason="pyarrow extension types aren't supported on Ray clusters.",
+)
 @pytest.mark.parametrize(
     ["if_true_storage", "if_false_storage", "expected_storage"],
     [
@@ -346,6 +351,10 @@ def test_series_if_else_extension_type(uuid_ext_type, if_true_storage, if_false_
     ARROW_VERSION < (12, 0, 0),
     reason=f"Arrow version {ARROW_VERSION} doesn't support the canonical tensor extension type.",
 )
+@pytest.mark.skipif(
+    get_context().runner_config.name == "ray",
+    reason="Pickling canonical tensor extension type is not supported by pyarrow",
+)
 @pytest.mark.parametrize(
     ["if_true", "if_false", "expected"],
     [
diff --git a/tests/series/test_size_bytes.py b/tests/series/test_size_bytes.py
index ff3b1934af..9b50766175 100644
--- a/tests/series/test_size_bytes.py
+++ b/tests/series/test_size_bytes.py
@@ -7,6 +7,7 @@
 import pyarrow as pa
 import pytest
 
+from daft.context import get_context
 from daft.datatype import DataType
 from daft.series import Series
 from tests.series import ARROW_FLOAT_TYPES, ARROW_INT_TYPES
@@ -181,6 +182,10 @@ def test_series_struct_size_bytes(size, with_nulls) -> None:
         assert s.size_bytes() == get_total_buffer_size(data) + conversion_to_large_string_bytes
 
 
+@pytest.mark.skipif(
+    get_context().runner_config.name == "ray",
+    reason="pyarrow extension types aren't supported on Ray clusters.",
+)
 @pytest.mark.parametrize("size", [1, 2, 8, 9, 16])
 @pytest.mark.parametrize("with_nulls", [True, False])
 def test_series_extension_type_size_bytes(uuid_ext_type, size, with_nulls) -> None:
@@ -207,6 +212,10 @@ def test_series_extension_type_size_bytes(uuid_ext_type, size, with_nulls) -> No
     ARROW_VERSION < (12, 0, 0),
     reason=f"Arrow version {ARROW_VERSION} doesn't support the canonical tensor extension type.",
 )
+@pytest.mark.skipif(
+    get_context().runner_config.name == "ray",
+    reason="Pickling canonical tensor extension type is not supported by pyarrow",
+)
 @pytest.mark.parametrize("dtype, size", itertools.product(ARROW_INT_TYPES + ARROW_FLOAT_TYPES, [0, 1, 2, 8, 9, 16]))
 @pytest.mark.parametrize("with_nulls", [True, False])
 def test_series_canonical_tensor_extension_type_size_bytes(dtype, size, with_nulls) -> None:
diff --git a/tests/series/test_take.py b/tests/series/test_take.py
index 6756d6e13e..847db326a4 100644
--- a/tests/series/test_take.py
+++ b/tests/series/test_take.py
@@ -4,6 +4,7 @@
 import pyarrow as pa
 import pytest
 
+from daft.context import get_context
 from daft.datatype import DataType
 from daft.series import Series
 from tests.series import ARROW_FLOAT_TYPES, ARROW_INT_TYPES, ARROW_STRING_TYPES
@@ -118,6 +119,10 @@ def test_series_struct_take() -> None:
     assert result.to_pylist() == expected
 
 
+@pytest.mark.skipif(
+    get_context().runner_config.name == "ray",
+    reason="pyarrow extension types aren't supported on Ray clusters.",
+)
 def test_series_extension_type_take(uuid_ext_type) -> None:
     pydata = [f"{i}".encode() for i in range(6)]
     pydata[2] = None
@@ -143,6 +148,10 @@ def test_series_extension_type_take(uuid_ext_type) -> None:
     ARROW_VERSION < (12, 0, 0),
     reason=f"Arrow version {ARROW_VERSION} doesn't support the canonical tensor extension type.",
 )
+@pytest.mark.skipif(
+    get_context().runner_config.name == "ray",
+    reason="Pickling canonical tensor extension type is not supported by pyarrow",
+)
 def test_series_canonical_tensor_extension_type_take() -> None:
     pydata = np.arange(24).reshape((6, 4)).tolist()
     pydata[2] = None
diff --git a/tests/table/test_from_py.py b/tests/table/test_from_py.py
index 99ea7fe09a..c65f456cc6 100644
--- a/tests/table/test_from_py.py
+++ b/tests/table/test_from_py.py
@@ -11,6 +11,7 @@
 from ray.data.extensions import ArrowTensorArray, ArrowTensorType
 
 from daft import DataType
+from daft.context import get_context
 from daft.series import Series
 from daft.table import Table
 
@@ -119,7 +120,7 @@
     "timestamp": pa.timestamp("us"),
 }
 
-if ARROW_VERSION >= (12, 0, 0):
+if ARROW_VERSION >= (12, 0, 0) and get_context().runner_config.name == "ray":
     ARROW_ROUNDTRIP_TYPES["canonical_tensor"] = pa.fixed_shape_tensor(pa.int64(), (2, 2))
     ARROW_TYPE_ARRAYS["canonical_tensor"] = pa.FixedShapeTensorArray.from_numpy_ndarray(
         np.array(PYTHON_TYPE_ARRAYS["tensor"])
@@ -127,6 +128,9 @@
 
 
 def _with_uuid_ext_type(uuid_ext_type) -> tuple[dict, dict]:
+    if get_context().runner_config.name == "ray":
+        # pyarrow extension types aren't supported in Ray clusters yet.
+        return ARROW_ROUNDTRIP_TYPES, ARROW_TYPE_ARRAYS
     arrow_roundtrip_types = ARROW_ROUNDTRIP_TYPES.copy()
     arrow_type_arrays = ARROW_TYPE_ARRAYS.copy()
     arrow_roundtrip_types["ext_type"] = uuid_ext_type