浏览器帮助对象（英语：Browser Helper Object，缩写：BHO）是一个DLL 模组。它被设计为微软公司开发的网页浏览器Internet Explorer的一个插件，以便提供一些附加功能。BHO在1997年10月于Internet Explorer 4中被引入。多数BHO都是在Internet Explorer每载入一个新的实例（通常是新窗口）时被执行。由于BHO在一些情形之下能拥有与浏览器本身一样的权限，因而这有可能会降低浏览器的安全性。

A Browser Helper Object (BHO) is a DLL module designed as a plugin for Microsoft's Internet Explorer web browser to provide added functionality. BHOs were introduced in October 1997 with the release of version 4 of Internet Explorer. Most BHOs are loaded once by each new instance of Internet Explorer. However, in the case of Windows Explorer, a new instance is launched for each window.