diff --git a/lldb/include/lldb/Host/HostInfo.h b/lldb/include/lldb/Host/HostInfo.h
index 0f7ec0e0aa0d2..46973edaf8c75 100644
--- a/lldb/include/lldb/Host/HostInfo.h
+++ b/lldb/include/lldb/Host/HostInfo.h
@@ -35,7 +35,10 @@
 #if defined(_WIN32)
 #include "lldb/Host/windows/HostInfoWindows.h"
 #define HOST_INFO_TYPE HostInfoWindows
-#elif defined(__linux__) || defined(__EMSCRIPTEN__)
+#elif defined(__EMSCRIPTEN__)
+#include "lldb/Host/emscripten/HostInfoEmscripten.h"
+#define HOST_INFO_TYPE HostInfoEmscripten
+#elif defined(__linux__)
 #if defined(__ANDROID__)
 #include "lldb/Host/android/HostInfoAndroid.h"
 #define HOST_INFO_TYPE HostInfoAndroid
diff --git a/lldb/include/lldb/Host/emscripten/HostInfoEmscripten.h b/lldb/include/lldb/Host/emscripten/HostInfoEmscripten.h
new file mode 100644
index 0000000000000..8c1cdcf58765b
--- /dev/null
+++ b/lldb/include/lldb/Host/emscripten/HostInfoEmscripten.h
@@ -0,0 +1,29 @@
+//===-- HostInfoEmscripten.h -----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_HOST_EMSCRIPTEN_HOSTINFOEMSCRIPTEN_H
+#define LLDB_HOST_EMSCRIPTEN_HOSTINFOEMSCRIPTEN_H
+
+#include "lldb/Host/posix/HostInfoPosix.h"
+#include "lldb/Utility/FileSpec.h"
+
+namespace lldb_private {
+
+class HostInfoEmscripten : public HostInfoPosix {
+  friend class HostInfoBase;
+
+public:
+  static void Initialize();
+  static void Terminate();
+
+  static FileSpec GetProgramFileSpec();
+};
+
+} // namespace lldb_private
+
+#endif // LLDB_HOST_EMSCRIPTEN_HOSTINFOEMSCRIPTEN_H
diff --git a/lldb/source/Host/CMakeLists.txt b/lldb/source/Host/CMakeLists.txt
index ebcad8f63e4f3..45821aa410912 100644
--- a/lldb/source/Host/CMakeLists.txt
+++ b/lldb/source/Host/CMakeLists.txt
@@ -111,10 +111,15 @@ else()
     posix/LockFilePosix.cpp
     posix/MainLoopPosix.cpp
     posix/PipePosix.cpp
-    posix/ProcessLauncherPosixFork.cpp
     posix/Support.cpp
     )
 
+  if (NOT EMSCRIPTEN)
+    add_host_subdirectory(posix
+      posix/ProcessLauncherPosixFork.cpp
+      )
+  endif()
+
   if (CMAKE_SYSTEM_NAME MATCHES "Darwin")
     add_subdirectory(macosx/objcxx)
     set(LLDBObjCLibs lldbHostMacOSXObjCXX)
@@ -135,8 +140,11 @@ else()
       set_property(SOURCE macosx/Host.mm APPEND PROPERTY
                COMPILE_DEFINITIONS "NO_XPC_SERVICES=1")
     endif()
-
-
+  elseif (CMAKE_SYSTEM_NAME MATCHES "Emscripten")
+    add_host_subdirectory(emscripten
+      emscripten/Host.cpp
+      emscripten/HostInfoEmscripten.cpp
+      )
   elseif (CMAKE_SYSTEM_NAME MATCHES "Linux|Android")
     add_host_subdirectory(linux
       linux/AbstractSocket.cpp
diff --git a/lldb/source/Host/common/Host.cpp b/lldb/source/Host/common/Host.cpp
index c4e1500fe68ab..fdf17db53ec3e 100644
--- a/lldb/source/Host/common/Host.cpp
+++ b/lldb/source/Host/common/Host.cpp
@@ -67,7 +67,7 @@
 #if defined(_WIN32)
 #include "lldb/Host/windows/ConnectionGenericFileWindows.h"
 #include "lldb/Host/windows/ProcessLauncherWindows.h"
-#else
+#elif !defined(__EMSCRIPTEN__)
 #include "lldb/Host/posix/ProcessLauncherPosixFork.h"
 #endif
 
@@ -581,7 +581,7 @@ Status Host::RunShellCommand(llvm::StringRef shell_path, const Args &args,
 
 // The functions below implement process launching for non-Apple-based
 // platforms
-#if !defined(__APPLE__)
+#if !defined(__APPLE__) && !defined(__EMSCRIPTEN__)
 Status Host::LaunchProcess(ProcessLaunchInfo &launch_info) {
   std::unique_ptr<ProcessLauncher> delegate_launcher;
 #if defined(_WIN32)
@@ -600,7 +600,7 @@ Status Host::LaunchProcess(ProcessLaunchInfo &launch_info) {
 
   return error;
 }
-#endif // !defined(__APPLE__)
+#endif // !defined(__APPLE__) && !defined(__EMSCRIPTEN__)
 
 #ifndef _WIN32
 void Host::Kill(lldb::pid_t pid, int signo) { ::kill(pid, signo); }
diff --git a/lldb/source/Host/emscripten/Host.cpp b/lldb/source/Host/emscripten/Host.cpp
new file mode 100644
index 0000000000000..005a2f83f4ec7
--- /dev/null
+++ b/lldb/source/Host/emscripten/Host.cpp
@@ -0,0 +1,29 @@
+//===-- Host.cpp ---------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Host/Host.h"
+#include "lldb/Utility/Status.h"
+
+using namespace lldb_private;
+
+uint32_t Host::FindProcessesImpl(const ProcessInstanceInfoMatch &,
+                                 ProcessInstanceInfoList &) {
+  return 0;
+}
+
+bool Host::GetProcessInfo(lldb::pid_t, ProcessInstanceInfo &) { return false; }
+
+Status Host::LaunchProcess(ProcessLaunchInfo &) {
+  return Status::FromErrorString(
+      "launching a host process is not supported under Emscripten");
+}
+
+Status Host::ShellExpandArguments(ProcessLaunchInfo &) {
+  return Status::FromErrorString(
+      "shell expansion is not supported under Emscripten");
+}
diff --git a/lldb/source/Host/emscripten/HostInfoEmscripten.cpp b/lldb/source/Host/emscripten/HostInfoEmscripten.cpp
new file mode 100644
index 0000000000000..10f0e2fc1dc4a
--- /dev/null
+++ b/lldb/source/Host/emscripten/HostInfoEmscripten.cpp
@@ -0,0 +1,17 @@
+//===-- HostInfoEmscripten.cpp -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Host/emscripten/HostInfoEmscripten.h"
+
+using namespace lldb_private;
+
+void HostInfoEmscripten::Initialize() { HostInfoPosix::Initialize(); }
+
+void HostInfoEmscripten::Terminate() { HostInfoBase::Terminate(); }
+
+FileSpec HostInfoEmscripten::GetProgramFileSpec() { return {}; }
diff --git a/lldb/source/Plugins/Platform/CMakeLists.txt b/lldb/source/Plugins/Platform/CMakeLists.txt
index cc1432aa4754b..8ad1c4ef31218 100644
--- a/lldb/source/Plugins/Platform/CMakeLists.txt
+++ b/lldb/source/Plugins/Platform/CMakeLists.txt
@@ -7,6 +7,7 @@ set_property(DIRECTORY PROPERTY LLDB_TOLERATED_PLUGIN_DEPENDENCIES
 
 add_subdirectory(AIX)
 add_subdirectory(Android)
+add_subdirectory(Emscripten)
 add_subdirectory(FreeBSD)
 add_subdirectory(gdb-server)
 add_subdirectory(Linux)
diff --git a/lldb/source/Plugins/Platform/Emscripten/CMakeLists.txt b/lldb/source/Plugins/Platform/Emscripten/CMakeLists.txt
new file mode 100644
index 0000000000000..3022c7692441a
--- /dev/null
+++ b/lldb/source/Plugins/Platform/Emscripten/CMakeLists.txt
@@ -0,0 +1,9 @@
+add_lldb_library(lldbPluginPlatformEmscripten PLUGIN
+  PlatformEmscripten.cpp
+
+  LINK_LIBS
+    lldbCore
+    lldbHost
+    lldbPluginPlatformPOSIX
+    lldbTarget
+  )
diff --git a/lldb/source/Plugins/Platform/Emscripten/PlatformEmscripten.cpp b/lldb/source/Plugins/Platform/Emscripten/PlatformEmscripten.cpp
new file mode 100644
index 0000000000000..01659e5556df4
--- /dev/null
+++ b/lldb/source/Plugins/Platform/Emscripten/PlatformEmscripten.cpp
@@ -0,0 +1,82 @@
+//===-- PlatformEmscripten.cpp -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "PlatformEmscripten.h"
+
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Host/HostInfo.h"
+#include "lldb/Utility/LLDBLog.h"
+#include "lldb/Utility/Log.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::platform_emscripten;
+
+LLDB_PLUGIN_DEFINE(PlatformEmscripten)
+
+static uint32_t g_initialize_count = 0;
+
+PlatformSP PlatformEmscripten::CreateInstance(bool force,
+                                              const ArchSpec *arch) {
+  Log *log = GetLog(LLDBLog::Platform);
+  LLDB_LOG(log, "force = {0}, arch=({1}, {2})", force,
+           arch ? arch->GetArchitectureName() : "<null>",
+           arch ? arch->GetTriple().getTriple() : "<null>");
+
+  bool create =
+      force || (arch && arch->IsValid() && arch->GetTriple().isOSEmscripten());
+  LLDB_LOG(log, "create = {0}", create);
+  return create ? PlatformSP(new PlatformEmscripten(false)) : PlatformSP();
+}
+
+llvm::StringRef PlatformEmscripten::GetPluginDescriptionStatic(bool is_host) {
+  if (is_host)
+    return "Local Emscripten user platform plug-in.";
+  return "Remote Emscripten user platform plug-in.";
+}
+
+void PlatformEmscripten::Initialize() {
+  PlatformPOSIX::Initialize();
+
+  if (g_initialize_count++ == 0) {
+#if defined(__EMSCRIPTEN__)
+    PlatformSP platform_sp(new PlatformEmscripten(true));
+    platform_sp->SetSystemArchitecture(HostInfo::GetArchitecture());
+    Platform::SetHostPlatform(platform_sp);
+#endif
+    PluginManager::RegisterPlugin(GetPluginNameStatic(false),
+                                  GetPluginDescriptionStatic(false),
+                                  PlatformEmscripten::CreateInstance, nullptr);
+  }
+}
+
+void PlatformEmscripten::Terminate() {
+  if (g_initialize_count > 0 && --g_initialize_count == 0)
+    PluginManager::UnregisterPlugin(PlatformEmscripten::CreateInstance);
+
+  PlatformPOSIX::Terminate();
+}
+
+PlatformEmscripten::PlatformEmscripten(bool is_host) : PlatformPOSIX(is_host) {
+  if (is_host)
+    m_supported_architectures.push_back(HostInfo::GetArchitecture());
+  else
+    m_supported_architectures = CreateArchList(
+        {llvm::Triple::wasm32, llvm::Triple::wasm64}, llvm::Triple::Emscripten);
+}
+
+std::vector<ArchSpec> PlatformEmscripten::GetSupportedArchitectures(
+    const ArchSpec &process_host_arch) {
+  if (m_remote_platform_sp)
+    return m_remote_platform_sp->GetSupportedArchitectures(process_host_arch);
+  return m_supported_architectures;
+}
+
+bool PlatformEmscripten::CanDebugProcess() {
+  return !IsHost() && IsConnected();
+}
diff --git a/lldb/source/Plugins/Platform/Emscripten/PlatformEmscripten.h b/lldb/source/Plugins/Platform/Emscripten/PlatformEmscripten.h
new file mode 100644
index 0000000000000..2b71001c2daf9
--- /dev/null
+++ b/lldb/source/Plugins/Platform/Emscripten/PlatformEmscripten.h
@@ -0,0 +1,50 @@
+//===-- PlatformEmscripten.h -----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_SOURCE_PLUGINS_PLATFORM_EMSCRIPTEN_PLATFORMEMSCRIPTEN_H
+#define LLDB_SOURCE_PLUGINS_PLATFORM_EMSCRIPTEN_PLATFORMEMSCRIPTEN_H
+
+#include "Plugins/Platform/POSIX/PlatformPOSIX.h"
+
+namespace lldb_private::platform_emscripten {
+
+class PlatformEmscripten : public PlatformPOSIX {
+public:
+  explicit PlatformEmscripten(bool is_host);
+
+  static void Initialize();
+  static void Terminate();
+
+  static lldb::PlatformSP CreateInstance(bool force, const ArchSpec *arch);
+
+  static llvm::StringRef GetPluginNameStatic(bool is_host) {
+    return is_host ? Platform::GetHostPlatformName() : "remote-emscripten";
+  }
+
+  static llvm::StringRef GetPluginDescriptionStatic(bool is_host);
+
+  llvm::StringRef GetPluginName() override {
+    return GetPluginNameStatic(IsHost());
+  }
+
+  llvm::StringRef GetDescription() override {
+    return GetPluginDescriptionStatic(IsHost());
+  }
+
+  std::vector<ArchSpec>
+  GetSupportedArchitectures(const ArchSpec &process_host_arch) override;
+
+  bool CanDebugProcess() override;
+
+private:
+  std::vector<ArchSpec> m_supported_architectures;
+};
+
+} // namespace lldb_private::platform_emscripten
+
+#endif // LLDB_SOURCE_PLUGINS_PLATFORM_EMSCRIPTEN_PLATFORMEMSCRIPTEN_H
diff --git a/lldb/unittests/Platform/CMakeLists.txt b/lldb/unittests/Platform/CMakeLists.txt
index 693faa07e53f8..f08d48ddfc203 100644
--- a/lldb/unittests/Platform/CMakeLists.txt
+++ b/lldb/unittests/Platform/CMakeLists.txt
@@ -2,6 +2,7 @@ add_lldb_unittest(LLDBPlatformTests
   TestUtils.cpp
   PlatformAppleSimulatorTest.cpp
   PlatformDarwinTest.cpp
+  PlatformEmscriptenTest.cpp
   PlatformMacOSXTest.cpp
   PlatformSiginfoTest.cpp
   PlatformTest.cpp
@@ -10,6 +11,7 @@ add_lldb_unittest(LLDBPlatformTests
   LINK_COMPONENTS
     Support
   LINK_LIBS
+    lldbPluginPlatformEmscripten
     lldbPluginPlatformFreeBSD
     lldbPluginPlatformLinux
     lldbPluginPlatformMacOSX
diff --git a/lldb/unittests/Platform/PlatformEmscriptenTest.cpp b/lldb/unittests/Platform/PlatformEmscriptenTest.cpp
new file mode 100644
index 0000000000000..e9c75ea9d4a97
--- /dev/null
+++ b/lldb/unittests/Platform/PlatformEmscriptenTest.cpp
@@ -0,0 +1,18 @@
+//===-- PlatformEmscriptenTest.cpp ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Plugins/Platform/Emscripten/PlatformEmscripten.h"
+#include "gtest/gtest.h"
+
+using namespace lldb_private;
+using namespace lldb_private::platform_emscripten;
+
+TEST(PlatformEmscriptenTest, RecognizesEmscriptenTriple) {
+  ArchSpec emscripten_arch("wasm32-unknown-emscripten");
+  EXPECT_TRUE(PlatformEmscripten::CreateInstance(false, &emscripten_arch));
+}