Index: lldb/source/Plugins/ScriptInterpreter/Lua/Lua.h
===================================================================
--- lldb/source/Plugins/ScriptInterpreter/Lua/Lua.h
+++ lldb/source/Plugins/ScriptInterpreter/Lua/Lua.h
@@ -10,6 +10,7 @@
 #define liblldb_Lua_h_
 
 #include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/StringSet.h"
 #include "llvm/Support/Error.h"
 
 #include "lua.hpp"
@@ -36,10 +37,12 @@
   }
 
   llvm::Error Run(llvm::StringRef buffer);
+  llvm::Error LoadModule(llvm::StringRef filename);
 
 private:
   std::mutex m_mutex;
   lua_State *m_lua_state;
+  llvm::StringSet<> m_loaded_modules;
 };
 
 } // namespace lldb_private
Index: lldb/source/Plugins/ScriptInterpreter/Lua/Lua.cpp
===================================================================
--- lldb/source/Plugins/ScriptInterpreter/Lua/Lua.cpp
+++ lldb/source/Plugins/ScriptInterpreter/Lua/Lua.cpp
@@ -7,10 +7,38 @@
 //===----------------------------------------------------------------------===//
 
 #include "Lua.h"
+#include "lldb/Host/FileSystem.h"
+#include "lldb/Utility/FileSpec.h"
 #include "llvm/Support/FormatVariadic.h"
 
 using namespace lldb_private;
 
+#define uchar(c) ((unsigned char)(c))
+
+static std::string FormatQuoted(llvm::StringRef str) {
+  std::string s;
+  llvm::raw_string_ostream oss(s);
+  oss << '"';
+  for (char c : str) {
+    if (c == '"' || c == '\\' || c == '\n') {
+      oss << '\\';
+      oss << c;
+    } else if (iscntrl(uchar(c))) {
+      char buff[10];
+      if (!isdigit(uchar(*(&c + 1))))
+        l_sprintf(buff, sizeof(buff), "\\%d", (int)uchar(c));
+      else
+        l_sprintf(buff, sizeof(buff), "\\%03d", (int)uchar(c));
+      oss << buff;
+    } else {
+      oss << c;
+    }
+  }
+  oss << '"';
+  oss.flush();
+  return s;
+}
+
 llvm::Error Lua::Run(llvm::StringRef buffer) {
   std::lock_guard<std::mutex> lock(m_mutex);
   int error =
@@ -26,3 +54,47 @@
   lua_pop(m_lua_state, 1);
   return e;
 }
+
+llvm::Error Lua::LoadModule(llvm::StringRef filename) {
+  FileSpec file(filename);
+  if (!FileSystem::Instance().Exists(file)) {
+    return llvm::make_error<llvm::StringError>("invalid path",
+                                               llvm::inconvertibleErrorCode());
+  }
+
+  ConstString module_extension = file.GetFileNameExtension();
+  if (module_extension != ".lua") {
+    return llvm::make_error<llvm::StringError>("invalid extension",
+                                               llvm::inconvertibleErrorCode());
+  }
+
+  ConstString module_name = file.GetFileNameStrippingExtension();
+  if (!module_name) {
+    return llvm::make_error<llvm::StringError>("invalid module name",
+                                               llvm::inconvertibleErrorCode());
+  }
+
+  // Don't clutter the package path and only add the module path if we haven't
+  // seen it before.
+  if (!m_loaded_modules.count(filename)) {
+    std::string s = ";";
+    s.append(file.GetCString());
+    if (llvm::Error e = Run(
+            llvm::formatv("package.path = package.path .. {0}", FormatQuoted(s))
+                .str())) {
+      return e;
+    }
+    m_loaded_modules.insert(filename);
+  }
+
+  llvm::StringRef module_name_ref = module_name.GetStringRef();
+  if (llvm::Error e = Run(
+          llvm::formatv("package.loaded.{0} = nil", module_name_ref).str())) {
+    return e;
+  }
+
+  // Import the module.
+  return Run(llvm::formatv("{0} = require {1}", module_name_ref,
+                           FormatQuoted(module_name_ref))
+                 .str());
+}
Index: lldb/source/Plugins/ScriptInterpreter/Lua/ScriptInterpreterLua.h
===================================================================
--- lldb/source/Plugins/ScriptInterpreter/Lua/ScriptInterpreterLua.h
+++ lldb/source/Plugins/ScriptInterpreter/Lua/ScriptInterpreterLua.h
@@ -25,6 +25,11 @@
 
   void ExecuteInterpreterLoop() override;
 
+  virtual bool
+  LoadScriptingModule(const char *filename, bool init_session,
+                      lldb_private::Status &error,
+                      StructuredData::ObjectSP *module_sp = nullptr) override;
+
   // Static Functions
   static void Initialize();
 
Index: lldb/source/Plugins/ScriptInterpreter/Lua/ScriptInterpreterLua.cpp
===================================================================
--- lldb/source/Plugins/ScriptInterpreter/Lua/ScriptInterpreterLua.cpp
+++ lldb/source/Plugins/ScriptInterpreter/Lua/ScriptInterpreterLua.cpp
@@ -77,6 +77,18 @@
   debugger.PushIOHandler(io_handler_sp);
 }
 
+bool ScriptInterpreterLua::LoadScriptingModule(
+    const char *filename, bool init_session, lldb_private::Status &error,
+    StructuredData::ObjectSP *module_sp) {
+
+  if (llvm::Error e = m_lua->LoadModule(filename)) {
+    error.SetErrorStringWithFormatv("lua failed to import '{0}': {1}\n",
+                                    filename, llvm::toString(std::move(e)));
+    return false;
+  }
+  return true;
+}
+
 void ScriptInterpreterLua::Initialize() {
   static llvm::once_flag g_once_flag;
 
Index: lldb/test/Shell/ScriptInterpreter/Lua/Inputs/testmodule.lua
===================================================================
--- /dev/null
+++ lldb/test/Shell/ScriptInterpreter/Lua/Inputs/testmodule.lua
@@ -0,0 +1,7 @@
+local mymodule = {}
+
+function mymodule.foo()
+  print("Hello World!")
+end
+
+return mymodule
Index: lldb/test/Shell/ScriptInterpreter/Lua/command_script_import.test
===================================================================
--- /dev/null
+++ lldb/test/Shell/ScriptInterpreter/Lua/command_script_import.test
@@ -0,0 +1,4 @@
+# REQUIRES: lua
+# RUN: %lldb --script-language lua -o 'command script import %S/Inputs/testmodule.lua' -o 'script testmodule.foo()' 2>&1 | FileCheck %s
+# RUN: %lldb --script-language lua -o 'command script import %S/Inputs/testmodule.lua' -o 'command script import %S/Inputs/testmodule.lua' -o 'script testmodule.foo()'  2>&1 | FileCheck %s
+# CHECK: Hello World!