活动模板库（Active Template Library (ATL)）是一个以C++模板技术的类的集合，是Microsoft为了简化组件对象模型（COM）的编程而发布的。 COM旨在允许开发者利用Visual C++创造各种各样的组件，包括OLE Automation服务器，与ActiveX控件。 Patterned after the Standard Template Library (STL), ATL 包含一个对象精灵（object wizard），当设置好主要的对象结构后，能够产生快速与较小的程序。

The Active Template Library (ATL) is a set of template-based C++ classes developed by Microsoft, intended to simplify the programming of Component Object Model (COM) objects. The COM support in Microsoft Visual C++ allows developers to create a variety of COM objects, OLE Automation servers, and ActiveX controls. ATL includes an object wizard that sets up primary structure of the objects quickly with a minimum of hand coding. On the COM client side ATL provides smart pointers that deal with COM reference counting. The library makes heavy use of the Curiously recurring template pattern.