diff --git a/src/graphql/utilities/coerce_input_value.py b/src/graphql/utilities/coerce_input_value.py
index 31237d1e..6017769c 100644
--- a/src/graphql/utilities/coerce_input_value.py
+++ b/src/graphql/utilities/coerce_input_value.py
@@ -70,7 +70,19 @@ def coerce_input_value(
         if is_iterable(input_value):
             coerced_list: List[Any] = []
             append_item = coerced_list.append
+            is_nested_list = bool(
+                is_list_type(item_type) and len(tuple(input_value)) > 1
+            )
             for index, item_value in enumerate(input_value):
+                if is_nested_list and not is_iterable(item_value):
+                    # Input values should be iterable for multivalued nested list type
+                    on_error(
+                        path.as_list() if path else Path(path, index, None).as_list(),
+                        item_value,
+                        GraphQLError(
+                            f"Expected type '{inspect(item_type)}' to be a list."
+                        ),
+                    )
                 append_item(
                     coerce_input_value(
                         item_value, item_type, on_error, Path(path, index, None)
diff --git a/tests/utilities/test_coerce_input_value.py b/tests/utilities/test_coerce_input_value.py
index f34e8564..5b0155df 100644
--- a/tests/utilities/test_coerce_input_value.py
+++ b/tests/utilities/test_coerce_input_value.py
@@ -352,13 +352,24 @@ def returns_null_for_a_null_value():
             result = _coerce_value(None, TestNestedList)
             assert expect_value(result) is None
 
-        def returns_nested_list_for_nested_non_list_values():
+        def returns_error_for_nested_non_list_values():
             result = _coerce_value([1, 2, 3], TestNestedList)
-            assert expect_value(result) == [[1], [2], [3]]
+            assert expect_errors(result) == [
+                ("Expected type '[Int]' to be a list.", [0], 1),
+                ("Expected type '[Int]' to be a list.", [1], 2),
+                ("Expected type '[Int]' to be a list.", [2], 3),
+            ]
 
         def returns_nested_null_for_nested_null_values():
+            result = _coerce_value([[None], [None]], TestNestedList)
+            assert expect_value(result) == [[None], [None]]
+
+        def returns_errors_for_null_values():
             result = _coerce_value([42, [None], None], TestNestedList)
-            assert expect_value(result) == [[42], [None], None]
+            assert expect_errors(result) == [
+                ("Expected type '[Int]' to be a list.", [0], 42),
+                ("Expected type '[Int]' to be a list.", [2], None),
+            ]
 
     def describe_with_default_on_error():
         def throw_error_without_path():