磁盘区阴影复制服务（英语：Volume Shadow Copy Service）是微软Windows的一项组件服务，从Windows Server 2003开始支持。

磁盘区阴影复制服务是一项定时为磁盘区作复制的服务。服务会在磁盘区添加一个名为「阴影复制」（Shadow Copy）的选项。这服务可为脱机用户提供脱机文件服务。

欲使用这项技术，文件系统必须为NTFS，才可创建和保存磁盘区阴影区复制。磁盘区阴影区复制可以由任何使用此技术的Windows原建在本地或外部磁盘（卸除式磁盘或网络磁盘）上创建。举例而言，调度的Windows备份或系统还原点时会用到此技术。

Shadow Copy (also known as Volume Snapshot Service, Volume Shadow Copy Service or VSS) is a technology included in Microsoft Windows that allows taking manual or automatic backup copies or snapshots of computer files or volumes, even when they are in use. It is implemented as a Windows service called the Volume Shadow Copy service. A software VSS provider service is also included as part of Windows to be used by Windows applications. Shadow Copy technology requires the file system to be NTFS in order to create and store shadow copies. Shadow Copies can be created on local and external (removable or network) volumes by any Windows component that uses this technology, such as when creating a scheduled Windows Backup or automatic System Restore point.