diff --git a/parquet-variant-compute/src/cast_to_variant.rs b/parquet-variant-compute/src/cast_to_variant.rs
index bce3a427a0f9..ed40538cabe1 100644
--- a/parquet-variant-compute/src/cast_to_variant.rs
+++ b/parquet-variant-compute/src/cast_to_variant.rs
@@ -229,6 +229,11 @@ pub fn cast_to_variant(input: &dyn Array) -> Result<VariantArray, ArrowError> {
         DataType::FixedSizeBinary(_) => {
             non_generic_conversion!(as_fixed_size_binary, |v| v, input, builder);
         }
+        DataType::Null => {
+            for _ in 0..input.len() {
+                builder.append_null();
+            }
+        }
         dt => {
             return Err(ArrowError::CastError(format!(
                 "Unsupported data type for casting to Variant: {dt:?}",
@@ -248,8 +253,8 @@ mod tests {
     use arrow::array::{
         ArrayRef, BooleanArray, Decimal128Array, Decimal256Array, Decimal32Array, Decimal64Array,
         FixedSizeBinaryBuilder, Float16Array, Float32Array, Float64Array, GenericByteBuilder,
-        GenericByteViewBuilder, Int16Array, Int32Array, Int64Array, Int8Array, UInt16Array,
-        UInt32Array, UInt64Array, UInt8Array,
+        GenericByteViewBuilder, Int16Array, Int32Array, Int64Array, Int8Array, NullArray,
+        UInt16Array, UInt32Array, UInt64Array, UInt8Array,
     };
     use arrow_schema::{
         DECIMAL128_MAX_PRECISION, DECIMAL32_MAX_PRECISION, DECIMAL64_MAX_PRECISION,
@@ -588,6 +593,11 @@ mod tests {
         )
     }
 
+    #[test]
+    fn test_cast_to_variant_null() {
+        run_test(Arc::new(NullArray::new(2)), vec![None, None])
+    }
+
     #[test]
     fn test_cast_to_variant_decimal32() {
         run_test(