diff --git a/apps/openmw/mwlua/luamanagerimp.cpp b/apps/openmw/mwlua/luamanagerimp.cpp
index c11a87eaac..8516e5e21f 100644
--- a/apps/openmw/mwlua/luamanagerimp.cpp
+++ b/apps/openmw/mwlua/luamanagerimp.cpp
@@ -401,7 +401,7 @@ namespace MWLua
         return localScripts->getActorControls();
     }
 
-    void LuaManager::addCustomLocalScript(const MWWorld::Ptr& ptr, int scriptId)
+    void LuaManager::addCustomLocalScript(const MWWorld::Ptr& ptr, int scriptId, std::string_view initData)
     {
         LocalScripts* localScripts = ptr.getRefData().getLuaScripts();
         if (!localScripts)
@@ -411,7 +411,7 @@ namespace MWLua
             if (ptr.isInCell() && MWBase::Environment::get().getWorldScene()->isCellActive(*ptr.getCell()))
                 mActiveLocalScripts.insert(localScripts);
         }
-        localScripts->addCustomScript(scriptId);
+        localScripts->addCustomScript(scriptId, initData);
     }
 
     LocalScripts* LuaManager::createLocalScripts(
diff --git a/apps/openmw/mwlua/luamanagerimp.hpp b/apps/openmw/mwlua/luamanagerimp.hpp
index 9d02d11a3d..6482b7ddeb 100644
--- a/apps/openmw/mwlua/luamanagerimp.hpp
+++ b/apps/openmw/mwlua/luamanagerimp.hpp
@@ -57,7 +57,7 @@ namespace MWLua
         void setupPlayer(const MWWorld::Ptr& ptr) override; // Should be called once after each "clear".
 
         // Used only in Lua bindings
-        void addCustomLocalScript(const MWWorld::Ptr&, int scriptId);
+        void addCustomLocalScript(const MWWorld::Ptr&, int scriptId, std::string_view initData);
         void addUIMessage(std::string_view message) { mUIMessages.emplace_back(message); }
         void addInGameConsoleMessage(const std::string& msg, const Misc::Color& color)
         {
diff --git a/apps/openmw/mwlua/objectbindings.cpp b/apps/openmw/mwlua/objectbindings.cpp
index ab0e686e86..4fe520e68c 100644
--- a/apps/openmw/mwlua/objectbindings.cpp
+++ b/apps/openmw/mwlua/objectbindings.cpp
@@ -200,9 +200,9 @@ namespace MWLua
 
             if constexpr (std::is_same_v<ObjectT, GObject>)
             { // Only for global scripts
-                objectT["addScript"] = [lua = context.mLua, luaManager = context.mLuaManager](
-                                           const GObject& object, std::string_view path) {
-                    const LuaUtil::ScriptsConfiguration& cfg = lua->getConfiguration();
+                objectT["addScript"] = [context](const GObject& object, std::string_view path,
+                                           sol::optional<sol::table> initData) {
+                    const LuaUtil::ScriptsConfiguration& cfg = context.mLua->getConfiguration();
                     std::optional<int> scriptId = cfg.findId(path);
                     if (!scriptId)
                         throw std::runtime_error("Unknown script: " + std::string(path));
@@ -211,7 +211,12 @@ namespace MWLua
                             "Script without CUSTOM tag can not be added dynamically: " + std::string(path));
                     if (object.ptr().getType() == ESM::REC_STAT)
                         throw std::runtime_error("Attaching scripts to Static is not allowed: " + std::string(path));
-                    luaManager->addCustomLocalScript(object.ptr(), *scriptId);
+                    if (initData)
+                        context.mLuaManager->addCustomLocalScript(
+                            object.ptr(), *scriptId, LuaUtil::serialize(*initData, context.mSerializer));
+                    else
+                        context.mLuaManager->addCustomLocalScript(
+                            object.ptr(), *scriptId, cfg[*scriptId].mInitializationData);
                 };
                 objectT["hasScript"] = [lua = context.mLua](const GObject& object, std::string_view path) {
                     const LuaUtil::ScriptsConfiguration& cfg = lua->getConfiguration();
diff --git a/components/lua/scriptscontainer.cpp b/components/lua/scriptscontainer.cpp
index 6b6151b293..6f18727019 100644
--- a/components/lua/scriptscontainer.cpp
+++ b/components/lua/scriptscontainer.cpp
@@ -35,14 +35,13 @@ namespace LuaUtil
         mAPI.emplace(std::move(packageName), makeReadOnly(std::move(package)));
     }
 
-    bool ScriptsContainer::addCustomScript(int scriptId)
+    bool ScriptsContainer::addCustomScript(int scriptId, std::string_view initData)
     {
-        const ScriptsConfiguration& conf = mLua.getConfiguration();
-        assert(conf.isCustomScript(scriptId));
+        assert(mLua.getConfiguration().isCustomScript(scriptId));
         std::optional<sol::function> onInit, onLoad;
         bool ok = addScript(scriptId, onInit, onLoad);
         if (ok && onInit)
-            callOnInit(scriptId, *onInit, conf[scriptId].mInitializationData);
+            callOnInit(scriptId, *onInit, initData);
         return ok;
     }
 
diff --git a/components/lua/scriptscontainer.hpp b/components/lua/scriptscontainer.hpp
index ebc7fd6d55..0177281be1 100644
--- a/components/lua/scriptscontainer.hpp
+++ b/components/lua/scriptscontainer.hpp
@@ -91,7 +91,7 @@ namespace LuaUtil
         // new script, adds it to the container, and calls onInit for this script. Returns `true` if the script was
         // successfully added. The script should have CUSTOM flag. If the flag is not set, or file not found, or has
         // syntax errors, returns false. If such script already exists in the container, then also returns false.
-        bool addCustomScript(int scriptId);
+        bool addCustomScript(int scriptId, std::string_view initData = "");
 
         bool hasScript(int scriptId) const { return mScripts.count(scriptId) != 0; }
         void removeScript(int scriptId);
diff --git a/files/lua_api/openmw/core.lua b/files/lua_api/openmw/core.lua
index 38f73ec669..a39df78911 100644
--- a/files/lua_api/openmw/core.lua
+++ b/files/lua_api/openmw/core.lua
@@ -144,6 +144,7 @@
 -- @function [parent=#GameObject] addScript
 -- @param self
 -- @param #string scriptPath Path to the script in OpenMW virtual filesystem.
+-- @param #table initData (optional) Initialization data to be passed to onInit. If missed then Lua initialization data from content files will be used (if exists for this script).
 
 ---
 -- Whether a script with given path is attached to this object.