CVS（英语：Concurrent Versions System，或Concurrent Versioning System）代表协作版本系统或者并发版本系统，是一种版本控制系统，方便软件的开发和用户协同工作。

很多开源或者自由软件项目都使用CVS作为其进程员之间的中心点，以便能够综合各进程员的改进和更改。这些项目包括：Gnome、KDE、GIMP、Wine等。CVS的使用获GNU通用公共许可证授权。

这是一个将一组文档放在层次目录树中以保持同步的系统。人们可以从CVS服务器上更新他们的本地层次树副本，并将修改的结果或新文档发回；或者删除旧文档。

The Concurrent Versions System (CVS), also known as the Concurrent Versioning System, is a client-server free software revision control system in the field of software development. A version control system keeps track of all work and all changes in a set of files, and allows several developers (potentially widely separated in space and time) to collaborate. Dick Grune developed CVS as a series of shell scripts in July 1986.