Windows Media Player是微软公司出品的一款免费媒体播放器，通常简称“WMP”，又称“WMPlayer”。它在Windows操作系统中作为一个组件内置，也可以从网络下载。它支持通过插件增强功能。在Windows Media Player 7及以后的版本支持更换界面外观。

该软件可以播放MP3、WMA、WAV等格式的文档，而RM文档由于竞争关系，微软默认但不支持；不过在Windows Media player 8以后的版本，如果安装了RealPlayer相关的解码器，就可以播放。视频方面可以播放AVI、WMV、MPEG-1、MPEG-2、DVD等格式的文档。用户可以自定媒体数据库收藏媒体档。支持播放列表，支持从CD抓取音轨复制到硬盘。支持刻录CD，Windows Media Player 9以后的版本甚至支持与便携式音乐设备同步音乐。集成了WindowsMedia.com的在线服务。Windows Media player 10更集成了纯商业的在线商店商业服务。支持图形界面更换。支持MMS与RTSP的流媒体。内部集成了Windows Media的专辑数据库，如果用户播放的音频档与网站上面的数据校对一致的话，用户可以看到专辑消息。支持外部安装插件增强功能。

Windows Media Player (abbreviated WMP) is a media player and media library application developed by Microsoft that is used for playing audio, video and viewing images on personal computers running the Microsoft Windows operating system, as well as on Pocket PC and Windows Mobile–based devices. Editions of Windows Media Player were also released for Mac OS, Mac OS X and Solaris but development of these has since been discontinued.