AutoRun和AutoPlay是微软窗口系统的组件，其内容标示着系统在搜索到设备时可采取的行动。

AutoRun在Windows 95时首度露面，目的是帮助用户正确运行光盘上制作者想要运行的文件，另外AutoRun也能透过双击我的电脑内的设备图标启动AutoRun。但后来随身碟病毒横行，微软发布更新关闭非光驱的AutoRun。

在Windows XP之后，微软让用户方便选择相关应用程序，制作出如图形化接口方式让用户选择如何处理设备中的文件。

请注意AutoPlay不等同于AutoRun。

AutoRun and the companion feature AutoPlay are components of the Microsoft Windows operating system that dictate what actions the system takes when a drive is mounted.

AutoRun was introduced in Windows 95 to ease application installation for non-technical users and reduce the cost of software support calls. When an appropriately configured CD-ROM is inserted into a CD-ROM drive, Windows detects the arrival and checks the contents for a special file containing a set of instructions. For a CD containing software, these instructions normally initiate installation of the software from the CD-ROM onto the hard drive. To maximise the likelihood of installation success, AutoRun also acts when the drive is accessed ("double-clicked") in Windows Explorer (or "My Computer").