diff --git a/airbyte-cdk/bulk/core/load/src/testFixtures/kotlin/io/airbyte/cdk/load/test/util/DefaultNamespaceProvider.kt b/airbyte-cdk/bulk/core/load/src/testFixtures/kotlin/io/airbyte/cdk/load/test/util/DefaultNamespaceProvider.kt
new file mode 100644
index 0000000000000..bf993f7581549
--- /dev/null
+++ b/airbyte-cdk/bulk/core/load/src/testFixtures/kotlin/io/airbyte/cdk/load/test/util/DefaultNamespaceProvider.kt
@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2024 Airbyte, Inc., all rights reserved.
+ */
+
+package io.airbyte.cdk.load.test.util
+
+interface DefaultNamespaceProvider {
+    fun get(randomNamespace: String): String?
+}
+
+class DefaultDefaultNamespaceProvider : DefaultNamespaceProvider {
+    override fun get(randomNamespace: String): String? = null
+}
diff --git a/airbyte-cdk/bulk/core/load/src/testFixtures/kotlin/io/airbyte/cdk/load/write/BasicFunctionalityIntegrationTest.kt b/airbyte-cdk/bulk/core/load/src/testFixtures/kotlin/io/airbyte/cdk/load/write/BasicFunctionalityIntegrationTest.kt
index 3906709d2915e..bef06a7f120fc 100644
--- a/airbyte-cdk/bulk/core/load/src/testFixtures/kotlin/io/airbyte/cdk/load/write/BasicFunctionalityIntegrationTest.kt
+++ b/airbyte-cdk/bulk/core/load/src/testFixtures/kotlin/io/airbyte/cdk/load/write/BasicFunctionalityIntegrationTest.kt
@@ -42,6 +42,8 @@ import io.airbyte.cdk.load.message.InputStreamCheckpoint
 import io.airbyte.cdk.load.message.Meta.Change
 import io.airbyte.cdk.load.message.StreamCheckpoint
 import io.airbyte.cdk.load.test.util.ConfigurationUpdater
+import io.airbyte.cdk.load.test.util.DefaultDefaultNamespaceProvider
+import io.airbyte.cdk.load.test.util.DefaultNamespaceProvider
 import io.airbyte.cdk.load.test.util.DestinationCleaner
 import io.airbyte.cdk.load.test.util.DestinationDataDumper
 import io.airbyte.cdk.load.test.util.ExpectedRecordMapper
@@ -151,6 +153,7 @@ abstract class BasicFunctionalityIntegrationTest(
     nameMapper: NameMapper = NoopNameMapper,
     additionalMicronautEnvs: List<String> = emptyList(),
     micronautProperties: Map<Property, String> = emptyMap(),
+    val defaultNamespaceProvider: DefaultNamespaceProvider = DefaultDefaultNamespaceProvider(),
     /**
      * Whether to actually verify that the connector wrote data to the destination. This should only
      * ever be disabled for test destinations (dev-null, etc.).
@@ -455,9 +458,9 @@ abstract class BasicFunctionalityIntegrationTest(
     @Test
     open fun testNamespaces() {
         assumeTrue(verifyDataWriting)
-        fun makeStream(namespace: String) =
+        fun makeStream(namespace: String?, name: String = "test_stream") =
             DestinationStream(
-                DestinationStream.Descriptor(namespace, "test_stream"),
+                DestinationStream.Descriptor(namespace, name),
                 Append,
                 ObjectType(linkedMapOf("id" to intType)),
                 generationId = 0,
@@ -466,12 +469,14 @@ abstract class BasicFunctionalityIntegrationTest(
             )
         val stream1 = makeStream(randomizedNamespace + "_1")
         val stream2 = makeStream(randomizedNamespace + "_2")
+        val streamWithDefaultNamespace = makeStream(null, randomizedNamespace + "_stream")
         runSync(
             updatedConfig,
             DestinationCatalog(
                 listOf(
                     stream1,
                     stream2,
+                    streamWithDefaultNamespace,
                 )
             ),
             listOf(
@@ -487,6 +492,12 @@ abstract class BasicFunctionalityIntegrationTest(
                     data = """{"id": 5678}""",
                     emittedAtMs = 1234,
                 ),
+                InputRecord(
+                    namespace = streamWithDefaultNamespace.descriptor.namespace,
+                    name = streamWithDefaultNamespace.descriptor.name,
+                    data = """{"id": 91011}""",
+                    emittedAtMs = 1234,
+                ),
             )
         )
         assertAll(
@@ -521,6 +532,27 @@ abstract class BasicFunctionalityIntegrationTest(
                     listOf(listOf("id")),
                     cursor = null
                 )
+            },
+            {
+                dumpAndDiffRecords(
+                    parsedConfig,
+                    listOf(
+                        OutputRecord(
+                            extractedAt = 1234,
+                            generationId = 0,
+                            data = mapOf("id" to 91011),
+                            airbyteMeta = OutputRecord.Meta(syncId = 42)
+                        )
+                    ),
+                    streamWithDefaultNamespace.copy(
+                        descriptor =
+                            streamWithDefaultNamespace.descriptor.copy(
+                                namespace = defaultNamespaceProvider.get(randomizedNamespace)
+                            )
+                    ),
+                    listOf(listOf("id")),
+                    cursor = null
+                )
             }
         )
     }
@@ -531,9 +563,10 @@ abstract class BasicFunctionalityIntegrationTest(
         fun makeStream(
             name: String,
             schema: LinkedHashMap<String, FieldType> = linkedMapOf("id" to intType),
+            namespaceSuffix: String = "",
         ) =
             DestinationStream(
-                DestinationStream.Descriptor(randomizedNamespace, name),
+                DestinationStream.Descriptor(randomizedNamespace + namespaceSuffix, name),
                 Append,
                 ObjectType(schema),
                 generationId = 0,
@@ -575,6 +608,11 @@ abstract class BasicFunctionalityIntegrationTest(
                         "groups",
                         linkedMapOf("id" to intType, "authorization" to stringType)
                     ),
+                    makeStream(
+                        "streamWithSpecialCharactersInNamespace",
+                        namespaceSuffix = "_spøcial"
+                    ),
+                    makeStream("streamWithOperatorInNamespace", namespaceSuffix = "_operator-1"),
                 )
             )
         // For each stream, generate a record containing every field in the schema.
diff --git a/airbyte-cdk/bulk/toolkits/load-avro/src/testFixtures/kotlin/io/airbyte/cdk/load/data/avro/AvroExpectedRecordMapper.kt b/airbyte-cdk/bulk/toolkits/load-avro/src/testFixtures/kotlin/io/airbyte/cdk/load/data/avro/AvroExpectedRecordMapper.kt
index 1f8fb64da99c1..1c4659c8ec3e4 100644
--- a/airbyte-cdk/bulk/toolkits/load-avro/src/testFixtures/kotlin/io/airbyte/cdk/load/data/avro/AvroExpectedRecordMapper.kt
+++ b/airbyte-cdk/bulk/toolkits/load-avro/src/testFixtures/kotlin/io/airbyte/cdk/load/data/avro/AvroExpectedRecordMapper.kt
@@ -34,7 +34,10 @@ object AvroExpectedRecordMapper : ExpectedRecordMapper {
     ): DestinationStream.Descriptor {
         // Map the special character but not the '+', because only the former is replaced in file
         // paths.
-        return descriptor.copy(name = descriptor.name.replace("é", "e"))
+        return descriptor.copy(
+            namespace = descriptor.namespace?.replace("ø", "o"),
+            name = descriptor.name.replace("é", "e")
+        )
     }
 
     private fun fieldNameMangler(value: AirbyteValue): AirbyteValue =
diff --git a/airbyte-integrations/connectors/destination-s3-data-lake/src/test-integration/kotlin/io/airbyte/integrations/destination/s3_data_lake/S3DataLakeWriteTest.kt b/airbyte-integrations/connectors/destination-s3-data-lake/src/test-integration/kotlin/io/airbyte/integrations/destination/s3_data_lake/S3DataLakeWriteTest.kt
index 853a733c0dd2f..f4388f9755cfc 100644
--- a/airbyte-integrations/connectors/destination-s3-data-lake/src/test-integration/kotlin/io/airbyte/integrations/destination/s3_data_lake/S3DataLakeWriteTest.kt
+++ b/airbyte-integrations/connectors/destination-s3-data-lake/src/test-integration/kotlin/io/airbyte/integrations/destination/s3_data_lake/S3DataLakeWriteTest.kt
@@ -162,6 +162,12 @@ class GlueWriteTest :
     override fun testFunkyCharacters() {
         super.testFunkyCharacters()
     }
+
+    @Test
+    @Disabled("https://github.com/airbytehq/airbyte-internal-issues/issues/11439")
+    override fun testNamespaces() {
+        super.testNamespaces()
+    }
 }
 
 class GlueAssumeRoleWriteTest :
@@ -179,6 +185,12 @@ class GlueAssumeRoleWriteTest :
     override fun testFunkyCharacters() {
         super.testFunkyCharacters()
     }
+
+    @Test
+    @Disabled("https://github.com/airbytehq/airbyte-internal-issues/issues/11439")
+    override fun testNamespaces() {
+        super.testNamespaces()
+    }
 }
 
 @Disabled(
diff --git a/airbyte-integrations/connectors/destination-s3/src/test-integration/kotlin/io/airbyte/integrations/destination/s3_v2/S3V2WriteTest.kt b/airbyte-integrations/connectors/destination-s3/src/test-integration/kotlin/io/airbyte/integrations/destination/s3_v2/S3V2WriteTest.kt
index 86b0c029d5274..cb74519f3daa6 100644
--- a/airbyte-integrations/connectors/destination-s3/src/test-integration/kotlin/io/airbyte/integrations/destination/s3_v2/S3V2WriteTest.kt
+++ b/airbyte-integrations/connectors/destination-s3/src/test-integration/kotlin/io/airbyte/integrations/destination/s3_v2/S3V2WriteTest.kt
@@ -10,6 +10,7 @@ import io.airbyte.cdk.load.command.aws.asMicronautProperties
 import io.airbyte.cdk.load.data.*
 import io.airbyte.cdk.load.data.avro.AvroExpectedRecordMapper
 import io.airbyte.cdk.load.message.InputRecord
+import io.airbyte.cdk.load.test.util.DefaultNamespaceProvider
 import io.airbyte.cdk.load.test.util.ExpectedRecordMapper
 import io.airbyte.cdk.load.test.util.NoopDestinationCleaner
 import io.airbyte.cdk.load.test.util.OutputRecord
@@ -53,6 +54,10 @@ abstract class S3V2WriteTest(
         expectedRecordMapper,
         additionalMicronautEnvs = S3V2Destination.additionalMicronautEnvs,
         micronautProperties = S3V2TestUtils.assumeRoleCredentials.asMicronautProperties(),
+        defaultNamespaceProvider =
+            object : DefaultNamespaceProvider {
+                override fun get(randomNamespace: String): String? = null
+            },
         isStreamSchemaRetroactive = false,
         supportsDedup = false,
         stringifySchemalessObjects = stringifySchemalessObjects,