diff --git a/openeo_processes_dask/process_implementations/comparison.py b/openeo_processes_dask/process_implementations/comparison.py
index a99a6ba..f5e688b 100644
--- a/openeo_processes_dask/process_implementations/comparison.py
+++ b/openeo_processes_dask/process_implementations/comparison.py
@@ -13,6 +13,8 @@
 __all__ = [
     "is_infinite",
     "is_valid",
+    "is_nan",
+    "is_nodata",
     "eq",
     "neq",
     "gt",
@@ -35,6 +37,16 @@ def is_valid(x: ArrayLike):
     return np.logical_and(notnull(x), finite)
 
 
+def is_nodata(x: ArrayLike):
+    return x is None
+
+
+def is_nan(x: ArrayLike):
+    if is_nodata(x):
+        return is_nodata(x)
+    return np.isnan(x)
+
+
 def eq(
     x: ArrayLike,
     y: ArrayLike,
diff --git a/tests/test_comparison.py b/tests/test_comparison.py
index d115884..d1ae993 100644
--- a/tests/test_comparison.py
+++ b/tests/test_comparison.py
@@ -9,13 +9,7 @@
 from openeo_pg_parser_networkx.pg_schema import ParameterReference
 
 from openeo_processes_dask.process_implementations import merge_cubes
-from openeo_processes_dask.process_implementations.comparison import (
-    between,
-    eq,
-    is_infinite,
-    is_valid,
-    neq,
-)
+from openeo_processes_dask.process_implementations.comparison import *
 from openeo_processes_dask.process_implementations.cubes.apply import apply
 from openeo_processes_dask.process_implementations.cubes.reduce import reduce_dimension
 from tests.general_checks import assert_numpy_equals_dask_numpy, general_output_checks
@@ -73,6 +67,33 @@ def test_is_inf(value, expected, is_dask):
         assert hasattr(output, "dask")
 
 
+@pytest.mark.parametrize(
+    "value,expected",
+    [
+        (1, False),
+        (np.nan, True),
+    ],
+)
+def test_is_nan(value, expected):
+    value = np.asarray(value)
+
+    is_dask = da.from_array(value)
+
+    output = is_nan(value)
+    np.testing.assert_array_equal(output, expected)
+
+    assert hasattr(is_nan(is_dask), "dask")
+
+
+@pytest.mark.parametrize(
+    "value,expected",
+    [(1, False), ("Test", False), (None, True), ([np.nan, np.nan], False)],
+)
+def test_is_nodata(value, expected):
+    output = is_nodata(value)
+    np.testing.assert_array_equal(output, expected)
+
+
 @pytest.mark.parametrize(
     "x, y, delta, case_sensitive",
     [