diff --git a/analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/KotlinDeclarationProvider.kt b/analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/KotlinDeclarationProvider.kt
index feb8a02c6fc..60d043d2cee 100644
--- a/analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/KotlinDeclarationProvider.kt
+++ b/analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/KotlinDeclarationProvider.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -35,6 +35,11 @@ public abstract class KotlinDeclarationProvider {
 
     public abstract fun findFilesForFacadeByPackage(packageFqName: FqName): Collection<KtFile>
     public abstract fun findFilesForFacade(facadeFqName: FqName): Collection<KtFile>
+
+    /**
+     * Currently we want only classes from libraries ([org.jetbrains.kotlin.analysis.decompiler.psi.file.KtClsFile])
+     */
+    public abstract fun findInternalFilesForFacade(facadeFqName: FqName): Collection<KtFile>
 }
 
 public abstract class KotlinDeclarationProviderFactory {
diff --git a/analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/impl/KotlinStaticDeclarationIndex.kt b/analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/impl/KotlinStaticDeclarationIndex.kt
index bb045a8b2f9..c4b4c46550b 100644
--- a/analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/impl/KotlinStaticDeclarationIndex.kt
+++ b/analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/impl/KotlinStaticDeclarationIndex.kt
@@ -10,6 +10,7 @@ import org.jetbrains.kotlin.psi.*
 
 internal class KotlinStaticDeclarationIndex {
     internal val facadeFileMap: MutableMap<FqName, MutableSet<KtFile>> = mutableMapOf()
+    internal val multiFileClassPartMap: MutableMap<FqName, MutableSet<KtFile>> = mutableMapOf()
     internal val classMap: MutableMap<FqName, MutableSet<KtClassOrObject>> = mutableMapOf()
     internal val typeAliasMap: MutableMap<FqName, MutableSet<KtTypeAlias>> = mutableMapOf()
     internal val topLevelFunctionMap: MutableMap<FqName, MutableSet<KtNamedFunction>> = mutableMapOf()
diff --git a/analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/impl/KotlinStaticDeclarationProvider.kt b/analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/impl/KotlinStaticDeclarationProvider.kt
index 6ce884aa80c..0e50d57efac 100644
--- a/analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/impl/KotlinStaticDeclarationProvider.kt
+++ b/analysis/analysis-api-providers/src/org/jetbrains/kotlin/analysis/providers/impl/KotlinStaticDeclarationProvider.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -8,7 +8,9 @@ package org.jetbrains.kotlin.analysis.providers.impl
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.openapi.vfs.impl.jar.CoreJarFileSystem
-import com.intellij.psi.*
+import com.intellij.psi.PsiElement
+import com.intellij.psi.PsiManager
+import com.intellij.psi.SingleRootFileViewProvider
 import com.intellij.psi.search.GlobalSearchScope
 import com.intellij.psi.stubs.StubElement
 import com.intellij.util.indexing.FileContent
@@ -77,6 +79,10 @@ public class KotlinStaticDeclarationProvider internal constructor(
             .filter { it.javaFileFacadeFqName == facadeFqName }
     }
 
+    override fun findInternalFilesForFacade(facadeFqName: FqName): Collection<KtFile> {
+        return index.multiFileClassPartMap[facadeFqName].orEmpty().filter { it.virtualFile in scope }
+    }
+
     override fun getTopLevelProperties(callableId: CallableId): Collection<KtProperty> =
         index.topLevelPropertyMap[callableId.packageName]
             ?.filter { ktProperty ->
@@ -240,7 +246,18 @@ public class KotlinStaticDeclarationProviderFactory(
         }
 
         loadBuiltIns().forEach { ktFileStub ->
-            addToFacadeFileMap(ktFileStub.psi)
+            val ktFile: KtFile = ktFileStub.psi
+            addToFacadeFileMap(ktFile)
+
+            val partNames = ktFileStub.facadePartSimpleNames
+            if (partNames != null) {
+                val packageFqName = ktFileStub.getPackageFqName()
+                for (partName in partNames) {
+                    val multiFileClassPartFqName: FqName = packageFqName.child(Name.identifier(partName))
+                    index.multiFileClassPartMap.computeIfAbsent(multiFileClassPartFqName) { mutableSetOf() }.add(ktFile)
+                }
+            }
+
             // top-level functions and properties, built-in classes
             ktFileStub.childrenStubs.forEach(::indexStub)
         }
diff --git a/analysis/light-classes-base/src/org/jetbrains/kotlin/asJava/KotlinAsJavaSupportBase.kt b/analysis/light-classes-base/src/org/jetbrains/kotlin/asJava/KotlinAsJavaSupportBase.kt
index 79867ba2d0a..484d62c48ac 100644
--- a/analysis/light-classes-base/src/org/jetbrains/kotlin/asJava/KotlinAsJavaSupportBase.kt
+++ b/analysis/light-classes-base/src/org/jetbrains/kotlin/asJava/KotlinAsJavaSupportBase.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
diff --git a/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/project/structure/EmptyKotlinDeclarationProvider.kt b/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/project/structure/EmptyKotlinDeclarationProvider.kt
index 76ee5cdb087..18a2c46de10 100644
--- a/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/project/structure/EmptyKotlinDeclarationProvider.kt
+++ b/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/project/structure/EmptyKotlinDeclarationProvider.kt
@@ -6,7 +6,10 @@
 package org.jetbrains.kotlin.analysis.low.level.api.fir.project.structure
 
 import org.jetbrains.kotlin.analysis.providers.KotlinDeclarationProvider
-import org.jetbrains.kotlin.name.*
+import org.jetbrains.kotlin.name.CallableId
+import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi.*
 
 internal object EmptyKotlinDeclarationProvider : KotlinDeclarationProvider() {
@@ -20,4 +23,5 @@ internal object EmptyKotlinDeclarationProvider : KotlinDeclarationProvider() {
     override fun getTopLevelCallableNamesInPackage(packageFqName: FqName) = emptySet<Name>()
     override fun findFilesForFacadeByPackage(packageFqName: FqName) = emptyList<KtFile>()
     override fun findFilesForFacade(facadeFqName: FqName) = emptyList<KtFile>()
-}
\ No newline at end of file
+    override fun findInternalFilesForFacade(facadeFqName: FqName) = emptyList<KtFile>()
+}
diff --git a/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/project/structure/FileBasedKotlinDeclarationProvider.kt b/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/project/structure/FileBasedKotlinDeclarationProvider.kt
index c7a99aa3716..118f15bf764 100644
--- a/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/project/structure/FileBasedKotlinDeclarationProvider.kt
+++ b/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/project/structure/FileBasedKotlinDeclarationProvider.kt
@@ -1,12 +1,15 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.analysis.low.level.api.fir.project.structure
 
 import org.jetbrains.kotlin.analysis.providers.KotlinDeclarationProvider
-import org.jetbrains.kotlin.name.*
+import org.jetbrains.kotlin.name.CallableId
+import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.utils.addIfNotNull
 import org.jetbrains.kotlin.utils.yieldIfNotNull
@@ -109,6 +112,8 @@ internal class FileBasedKotlinDeclarationProvider(private val kotlinFile: KtFile
         return emptyList()
     }
 
+    override fun findInternalFilesForFacade(facadeFqName: FqName): Collection<KtFile> = emptyList()
+
     private inline fun <reified T : KtCallableDeclaration> getTopLevelCallables(callableId: CallableId): Collection<T> {
         require(callableId.classId == null)
         return getTopLevelDeclarations(callableId.packageName, callableId.callableName)
diff --git a/analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/SymbolKotlinAsJavaSupport.kt b/analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/SymbolKotlinAsJavaSupport.kt
index 5149880e877..75e1bcd1e13 100644
--- a/analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/SymbolKotlinAsJavaSupport.kt
+++ b/analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/SymbolKotlinAsJavaSupport.kt
@@ -11,6 +11,8 @@ import com.intellij.psi.PsiClass
 import com.intellij.psi.PsiElement
 import com.intellij.psi.search.GlobalSearchScope
 import org.jetbrains.kotlin.analysis.decompiled.light.classes.DecompiledLightClassesFactory
+import org.jetbrains.kotlin.analysis.decompiled.light.classes.KtLightClassForDecompiledDeclaration
+import org.jetbrains.kotlin.analysis.decompiler.psi.file.KtClsFile
 import org.jetbrains.kotlin.analysis.project.structure.*
 import org.jetbrains.kotlin.analysis.providers.createAllLibrariesModificationTracker
 import org.jetbrains.kotlin.analysis.providers.createDeclarationProvider
@@ -130,8 +132,30 @@ class SymbolKotlinAsJavaSupport(project: Project) : KotlinAsJavaSupportBase<KtMo
 
     override fun getScriptClasses(scriptFqName: FqName, scope: GlobalSearchScope): Collection<PsiClass> = error("Should not be called")
 
-    //TODO Implement if necessary for symbol
-    override fun getKotlinInternalClasses(fqName: FqName, scope: GlobalSearchScope): Collection<PsiClass> = emptyList()
+    override fun getKotlinInternalClasses(fqName: FqName, scope: GlobalSearchScope): Collection<PsiClass> {
+        val facadeKtFiles = project.createDeclarationProvider(scope).findInternalFilesForFacade(fqName)
+        if (facadeKtFiles.isEmpty()) return emptyList()
+
+        val partShortName = fqName.shortName().asString()
+        val partClassFileShortName = "$partShortName.class"
+
+        return facadeKtFiles.mapNotNull { facadeKtFile ->
+            if (facadeKtFile is KtClsFile) {
+                val partClassFile = facadeKtFile.virtualFile.parent.findChild(partClassFileShortName) ?: return@mapNotNull null
+                val psiFile = facadeKtFile.manager.findFile(partClassFile) as? KtClsFile ?: facadeKtFile
+                val javaClsClass = DecompiledLightClassesFactory.createClsJavaClassFromVirtualFile(
+                    mirrorFile = psiFile,
+                    classFile = partClassFile,
+                    correspondingClassOrObject = null,
+                    project = project,
+                ) ?: return@mapNotNull null
+
+                KtLightClassForDecompiledDeclaration(javaClsClass, javaClsClass.parent, psiFile, null)
+            } else {
+                null
+            }
+        }
+    }
 
     override fun findFilesForFacade(facadeFqName: FqName, searchScope: GlobalSearchScope): Collection<KtFile> {
         return project.createDeclarationProvider(searchScope).findFilesForFacade(facadeFqName)
diff --git a/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/decompiled/SymbolLightClassesByFqNameForLibraryTestGenerated.java b/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/decompiled/SymbolLightClassesByFqNameForLibraryTestGenerated.java
index 7391c0b5df1..c15430c8a91 100644
--- a/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/decompiled/SymbolLightClassesByFqNameForLibraryTestGenerated.java
+++ b/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/decompiled/SymbolLightClassesByFqNameForLibraryTestGenerated.java
@@ -319,6 +319,12 @@ public class SymbolLightClassesByFqNameForLibraryTestGenerated extends AbstractS
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/facades/AllPrivate.kt");
         }
 
+        @Test
+        @TestMetadata("InternalFacadeClass.kt")
+        public void testInternalFacadeClass() throws Exception {
+            runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.kt");
+        }
+
         @Test
         @TestMetadata("MultiFile.kt")
         public void testMultiFile() throws Exception {
diff --git a/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/decompiled/SymbolLightClassesParentingForLibraryTestGenerated.java b/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/decompiled/SymbolLightClassesParentingForLibraryTestGenerated.java
index 2d1afe90906..dd975f83ec8 100644
--- a/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/decompiled/SymbolLightClassesParentingForLibraryTestGenerated.java
+++ b/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/decompiled/SymbolLightClassesParentingForLibraryTestGenerated.java
@@ -319,6 +319,12 @@ public class SymbolLightClassesParentingForLibraryTestGenerated extends Abstract
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/facades/AllPrivate.kt");
         }
 
+        @Test
+        @TestMetadata("InternalFacadeClass.kt")
+        public void testInternalFacadeClass() throws Exception {
+            runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.kt");
+        }
+
         @Test
         @TestMetadata("MultiFile.kt")
         public void testMultiFile() throws Exception {
diff --git a/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/source/SymbolLightClassesByFqNameForSourceTestGenerated.java b/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/source/SymbolLightClassesByFqNameForSourceTestGenerated.java
index 69dec8dffa4..62db75c76f2 100644
--- a/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/source/SymbolLightClassesByFqNameForSourceTestGenerated.java
+++ b/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/source/SymbolLightClassesByFqNameForSourceTestGenerated.java
@@ -461,6 +461,12 @@ public class SymbolLightClassesByFqNameForSourceTestGenerated extends AbstractSy
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/facades/AllPrivate.kt");
         }
 
+        @Test
+        @TestMetadata("InternalFacadeClass.kt")
+        public void testInternalFacadeClass() throws Exception {
+            runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.kt");
+        }
+
         @Test
         @TestMetadata("MultiFile.kt")
         public void testMultiFile() throws Exception {
diff --git a/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/source/SymbolLightClassesParentingForSourceTestGenerated.java b/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/source/SymbolLightClassesParentingForSourceTestGenerated.java
index 3f4b9ccf0d3..50908ed90d2 100644
--- a/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/source/SymbolLightClassesParentingForSourceTestGenerated.java
+++ b/analysis/symbol-light-classes/tests/org/jetbrains/kotlin/light/classes/symbol/source/SymbolLightClassesParentingForSourceTestGenerated.java
@@ -461,6 +461,12 @@ public class SymbolLightClassesParentingForSourceTestGenerated extends AbstractS
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/facades/AllPrivate.kt");
         }
 
+        @Test
+        @TestMetadata("InternalFacadeClass.kt")
+        public void testInternalFacadeClass() throws Exception {
+            runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.kt");
+        }
+
         @Test
         @TestMetadata("MultiFile.kt")
         public void testMultiFile() throws Exception {
diff --git a/compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.java b/compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.java
new file mode 100644
index 00000000000..ff225862b52
--- /dev/null
+++ b/compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.java
@@ -0,0 +1 @@
+// NOT_GENERATED
\ No newline at end of file
diff --git a/compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.kt b/compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.kt
new file mode 100644
index 00000000000..b1ebf94aff9
--- /dev/null
+++ b/compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.kt
@@ -0,0 +1,6 @@
+// test.MultiFile__InternalFacadeClassKt
+// WITH_STDLIB
+@file:[JvmMultifileClass JvmName("MultiFile")]
+package test
+
+val foo = 42
diff --git a/compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.lib.java b/compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.lib.java
new file mode 100644
index 00000000000..ebbe0b262f7
--- /dev/null
+++ b/compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.lib.java
@@ -0,0 +1,5 @@
+final class MultiFile__InternalFacadeClassKt /* test.MultiFile__InternalFacadeClassKt*/ {
+  private static final int foo;
+
+  public static final int getFoo();//  getFoo()
+}
diff --git a/compiler/tests-gen/org/jetbrains/kotlin/asJava/CompilerLightClassTestGenerated.java b/compiler/tests-gen/org/jetbrains/kotlin/asJava/CompilerLightClassTestGenerated.java
index 9a0166194b4..77999498a14 100644
--- a/compiler/tests-gen/org/jetbrains/kotlin/asJava/CompilerLightClassTestGenerated.java
+++ b/compiler/tests-gen/org/jetbrains/kotlin/asJava/CompilerLightClassTestGenerated.java
@@ -407,6 +407,11 @@ public class CompilerLightClassTestGenerated extends AbstractCompilerLightClassT
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/facades/AllPrivate.kt");
         }
 
+        @TestMetadata("InternalFacadeClass.kt")
+        public void testInternalFacadeClass() throws Exception {
+            runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/facades/InternalFacadeClass.kt");
+        }
+
         @TestMetadata("MultiFile.kt")
         public void testMultiFile() throws Exception {
             runTest("compiler/testData/asJava/lightClasses/lightClassByFqName/facades/MultiFile.kt");