diff --git a/include/swift/AST/Module.h b/include/swift/AST/Module.h
index e6b2077189478..4a78fd02e94e2 100644
--- a/include/swift/AST/Module.h
+++ b/include/swift/AST/Module.h
@@ -173,6 +173,8 @@ class ModuleDecl
   /// The ABI name of the module, if it differs from the module name.
   mutable Identifier ModuleABIName;
 
+  /// The name of the package this module belongs to
+  mutable Identifier PackageName;
 public:
   /// Produces the components of a given module's full name in reverse order.
   ///
@@ -400,6 +402,14 @@ class ModuleDecl
     ModuleABIName = name;
   }
 
+  /// Get the package name of the module
+  Identifier getPackageName() const { return PackageName; }
+
+  /// Set the name of the package this module belongs to
+  void setPackageName(Identifier name) {
+    PackageName = name;
+  }
+
   /// Retrieve the actual module name of an alias used for this module (if any).
   ///
   /// For example, if '-module-alias Foo=Bar' is passed in when building the main module,
diff --git a/include/swift/Frontend/FrontendOptions.h b/include/swift/Frontend/FrontendOptions.h
index 01dc7f12f68e6..c47fdaae886e7 100644
--- a/include/swift/Frontend/FrontendOptions.h
+++ b/include/swift/Frontend/FrontendOptions.h
@@ -64,6 +64,9 @@ class FrontendOptions {
   /// The name of the library to link against when using this module.
   std::string ModuleLinkName;
 
+  /// The name of the package this module belongs to.
+  std::string PackageName;
+
   /// Arguments which should be passed in immediate mode.
   std::vector<std::string> ImmediateArgv;
 
diff --git a/include/swift/Option/Options.td b/include/swift/Option/Options.td
index f745c8634891a..02300bd795117 100644
--- a/include/swift/Option/Options.td
+++ b/include/swift/Option/Options.td
@@ -481,6 +481,9 @@ def autolink_force_load : Flag<["-"], "autolink-force-load">,
 def module_abi_name : Separate<["-"], "module-abi-name">,
   Flags<[FrontendOption, ModuleInterfaceOption]>,
   HelpText<"ABI name to use for the contents of this module">;
+def package_name : Separate<["-"], "package-name">,
+  Flags<[FrontendOption, ModuleInterfaceOptionIgnorable]>,
+  HelpText<"Name of the package the module belongs to">;
 
 def emit_module : Flag<["-"], "emit-module">,
   Flags<[FrontendOption, NoInteractiveOption, SupplementaryOutput]>,
diff --git a/include/swift/Serialization/Validation.h b/include/swift/Serialization/Validation.h
index dd83ece9be8c9..99517345ecccf 100644
--- a/include/swift/Serialization/Validation.h
+++ b/include/swift/Serialization/Validation.h
@@ -107,6 +107,7 @@ class ExtendedValidationInfo {
   SmallVector<StringRef, 4> ExtraClangImporterOpts;
   std::string SDKPath;
   StringRef ModuleABIName;
+  StringRef ModulePackageName;
   struct {
     unsigned ArePrivateImportsEnabled : 1;
     unsigned IsSIB : 1;
@@ -179,6 +180,9 @@ class ExtendedValidationInfo {
   StringRef getModuleABIName() const { return ModuleABIName; }
   void setModuleABIName(StringRef name) { ModuleABIName = name; }
 
+  StringRef getModulePackageName() const { return ModulePackageName; }
+  void setModulePackageName(StringRef name) { ModulePackageName = name; }
+
   bool isConcurrencyChecked() const {
     return Bits.IsConcurrencyChecked;
   }
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index 26d42bd2a8073..c0ee9217e86fa 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -252,6 +252,7 @@ void ToolChain::addCommonFrontendArgs(const OutputInfo &OI,
   inputArgs.AddLastArg(arguments, options::OPT_module_cache_path);
   inputArgs.AddLastArg(arguments, options::OPT_module_link_name);
   inputArgs.AddLastArg(arguments, options::OPT_module_abi_name);
+  inputArgs.AddLastArg(arguments, options::OPT_package_name);
   inputArgs.AddLastArg(arguments, options::OPT_nostdimport);
   inputArgs.AddLastArg(arguments, options::OPT_parse_stdlib);
   inputArgs.AddLastArg(arguments, options::OPT_resource_dir);
diff --git a/lib/Frontend/ArgsToFrontendOptionsConverter.cpp b/lib/Frontend/ArgsToFrontendOptionsConverter.cpp
index a9354dc84fedf..8b62929526033 100644
--- a/lib/Frontend/ArgsToFrontendOptionsConverter.cpp
+++ b/lib/Frontend/ArgsToFrontendOptionsConverter.cpp
@@ -269,6 +269,9 @@ bool ArgsToFrontendOptionsConverter::convert(
   if (const Arg *A = Args.getLastArg(OPT_module_link_name))
     Opts.ModuleLinkName = A->getValue();
 
+  if (const Arg *A = Args.getLastArg(OPT_package_name))
+    Opts.PackageName = A->getValue();
+
   // This must be called after computing module name, module abi name,
   // and module link name. If computing module aliases is unsuccessful,
   // return early.
diff --git a/lib/Frontend/Frontend.cpp b/lib/Frontend/Frontend.cpp
index 6ee558dc03de1..17f75a72987fa 100644
--- a/lib/Frontend/Frontend.cpp
+++ b/lib/Frontend/Frontend.cpp
@@ -1059,6 +1059,10 @@ ModuleDecl *CompilerInstance::getMainModule() const {
       MainModule->setABIName(getASTContext().getIdentifier(
           Invocation.getFrontendOptions().ModuleABIName));
     }
+    if (!Invocation.getFrontendOptions().PackageName.empty()) {
+      MainModule->setPackageName(getASTContext().getIdentifier(
+          Invocation.getFrontendOptions().PackageName));
+    }
     if (Invocation.getFrontendOptions().EnableLibraryEvolution)
       MainModule->setResilienceStrategy(ResilienceStrategy::Resilient);
     if (Invocation.getLangOptions().isSwiftVersionAtLeast(6))
diff --git a/lib/Serialization/ModuleFile.h b/lib/Serialization/ModuleFile.h
index 0eca215cf0c3b..186258478f4df 100644
--- a/lib/Serialization/ModuleFile.h
+++ b/lib/Serialization/ModuleFile.h
@@ -532,6 +532,9 @@ class ModuleFile
     return Core->Name;
   }
 
+  StringRef getModulePackageName() const {
+    return Core->ModulePackageName;
+  }
   /// The ABI name of the module.
   StringRef getModuleABIName() const {
     return Core->ModuleABIName;
diff --git a/lib/Serialization/ModuleFileSharedCore.cpp b/lib/Serialization/ModuleFileSharedCore.cpp
index dd8085c787877..95d080f3a591b 100644
--- a/lib/Serialization/ModuleFileSharedCore.cpp
+++ b/lib/Serialization/ModuleFileSharedCore.cpp
@@ -163,6 +163,9 @@ static bool readOptionsBlock(llvm::BitstreamCursor &cursor,
     case options_block::IS_CONCURRENCY_CHECKED:
       extendedInfo.setIsConcurrencyChecked(true);
       break;
+    case options_block::MODULE_PACKAGE_NAME:
+      extendedInfo.setModulePackageName(blobData);
+      break;
     default:
       // Unknown options record, possibly for use by a future version of the
       // module format.
@@ -1346,6 +1349,7 @@ ModuleFileSharedCore::ModuleFileSharedCore(
       Bits.IsConcurrencyChecked = extInfo.isConcurrencyChecked();
       MiscVersion = info.miscVersion;
       ModuleABIName = extInfo.getModuleABIName();
+      ModulePackageName = extInfo.getModulePackageName();
 
       hasValidControlBlock = true;
       break;
diff --git a/lib/Serialization/ModuleFileSharedCore.h b/lib/Serialization/ModuleFileSharedCore.h
index b4e4fa601d19f..b9b2b66b921cf 100644
--- a/lib/Serialization/ModuleFileSharedCore.h
+++ b/lib/Serialization/ModuleFileSharedCore.h
@@ -82,6 +82,9 @@ class ModuleFileSharedCore {
   /// The module ABI name.
   StringRef ModuleABIName;
 
+  /// The name of the package this module belongs to.
+  StringRef ModulePackageName;
+
   /// \c true if this module has incremental dependency information.
   bool HasIncrementalInfo = false;
 
diff --git a/lib/Serialization/ModuleFormat.h b/lib/Serialization/ModuleFormat.h
index c3973648a4082..5565f5d4fbef9 100644
--- a/lib/Serialization/ModuleFormat.h
+++ b/lib/Serialization/ModuleFormat.h
@@ -58,7 +58,7 @@ const uint16_t SWIFTMODULE_VERSION_MAJOR = 0;
 /// describe what change you made. The content of this comment isn't important;
 /// it just ensures a conflict if two people change the module format.
 /// Don't worry about adhering to the 80-column limit for this line.
-const uint16_t SWIFTMODULE_VERSION_MINOR = 727; // closure capture args
+const uint16_t SWIFTMODULE_VERSION_MINOR = 728; // package name field
 
 /// A standard hash seed used for all string hashes in a serialized module.
 ///
@@ -836,6 +836,7 @@ namespace options_block {
     IS_ALLOW_MODULE_WITH_COMPILER_ERRORS_ENABLED,
     MODULE_ABI_NAME,
     IS_CONCURRENCY_CHECKED,
+    MODULE_PACKAGE_NAME,
   };
 
   using SDKPathLayout = BCRecordLayout<
@@ -894,6 +895,11 @@ namespace options_block {
   using IsConcurrencyCheckedLayout = BCRecordLayout<
     IS_CONCURRENCY_CHECKED
   >;
+
+  using ModulePackageNameLayout = BCRecordLayout<
+    MODULE_PACKAGE_NAME,
+    BCBlob
+  >;
 }
 
 /// The record types within the input block.
diff --git a/lib/Serialization/Serialization.cpp b/lib/Serialization/Serialization.cpp
index cc8e5233ecf16..d1c4e39a2aa00 100644
--- a/lib/Serialization/Serialization.cpp
+++ b/lib/Serialization/Serialization.cpp
@@ -842,6 +842,7 @@ void Serializer::writeBlockInfoBlock() {
   BLOCK_RECORD(options_block, IS_ALLOW_MODULE_WITH_COMPILER_ERRORS_ENABLED);
   BLOCK_RECORD(options_block, MODULE_ABI_NAME);
   BLOCK_RECORD(options_block, IS_CONCURRENCY_CHECKED);
+  BLOCK_RECORD(options_block, MODULE_PACKAGE_NAME);
 
   BLOCK(INPUT_BLOCK);
   BLOCK_RECORD(input_block, IMPORTED_MODULE);
@@ -1064,6 +1065,11 @@ void Serializer::writeHeader(const SerializationOptions &options) {
         ABIName.emit(ScratchRecord, M->getABIName().str());
       }
 
+      if (!M->getPackageName().empty()) {
+        options_block::ModulePackageNameLayout PackageName(Out);
+        PackageName.emit(ScratchRecord, M->getPackageName().str());
+      }
+
       if (M->isConcurrencyChecked()) {
         options_block::IsConcurrencyCheckedLayout IsConcurrencyChecked(Out);
         IsConcurrencyChecked.emit(ScratchRecord);
diff --git a/lib/Serialization/SerializedModuleLoader.cpp b/lib/Serialization/SerializedModuleLoader.cpp
index e9080e3a25f29..360585f53d115 100644
--- a/lib/Serialization/SerializedModuleLoader.cpp
+++ b/lib/Serialization/SerializedModuleLoader.cpp
@@ -779,6 +779,8 @@ LoadedFile *SerializedModuleLoaderBase::loadAST(
       M.setABIName(Ctx.getIdentifier(loadedModuleFile->getModuleABIName()));
     if (loadedModuleFile->isConcurrencyChecked())
       M.setIsConcurrencyChecked();
+    if (!loadedModuleFile->getModulePackageName().empty())
+      M.setPackageName(Ctx.getIdentifier(loadedModuleFile->getModulePackageName()));
     M.setUserModuleVersion(loadedModuleFile->getUserModuleVersion());
     for (auto name: loadedModuleFile->getAllowableClientNames()) {
       M.addAllowableClientName(Ctx.getIdentifier(name));
diff --git a/test/Serialization/module_package_name.swift b/test/Serialization/module_package_name.swift
new file mode 100644
index 0000000000000..5dc1512337af3
--- /dev/null
+++ b/test/Serialization/module_package_name.swift
@@ -0,0 +1,15 @@
+// RUN: %empty-directory(%t)
+// RUN: %{python} %utils/split_file.py -o %t %s
+
+// RUN: %target-swift-frontend -module-name Logging -package-name MyLoggingPkg %t/File.swift -emit-module -emit-module-path %t/Logging.swiftmodule
+// RUN: test -f %t/Logging.swiftmodule
+// RUN: llvm-bcanalyzer -dump %t/Logging.swiftmodule | %FileCheck %s -check-prefix CHECK-BLOB
+// CHECK-BLOB: <MODULE_PACKAGE_NAME abbrevid=5/> blob data = 'MyLoggingPkg'
+
+// RUN: %target-swift-frontend -module-name Logging -package-name MyLoggingPkg %t/File.swift -emit-module -emit-module-interface-path %t/Logging.swiftinterface -swift-version 5 -enable-library-evolution -I %t
+// RUN: test -f %t/Logging.swiftinterface
+// RUN: %FileCheck %s -input-file %t/Logging.swiftinterface -check-prefix CHECK-FLAG
+// CHECK-FLAG: -package-name MyLoggingPkg
+
+// BEGIN File.swift
+public func log(level: Int) {}