WMV（Windows Media Video）是微软公司开发的一组数字视频编解码格式的通称，它是Windows Media架构下的一部分。

它最初是为低速率流媒体应用作为专有编解码开发出来的，但是2003年微软公司基于Windows Media Video第9版编解码起草了视频编解码规范并且提交给SMPTE申请作为标准。这个标准在2006年3月作为SMPTE 421M被正式批准，这样Windows Media Video 9编解码就不再是一个专有的技术。早期的编解码版本（7和8）仍然被认为是专有技术，因为它们不在SMPTE 421M标准的涵盖范围内。

Windows Media Video (WMV) is the name of a series of video codecs and their corresponding video coding formats developed by Microsoft. It is part of the Windows Media framework. WMV consists of three distinct codecs: The original video compression technology known as WMV, was originally designed for Internet streaming applications, as a competitor to RealVideo. The other compression technologies, WMV Screen and WMV Image, cater for specialized content. After standardization by the Society of Motion Picture and Television Engineers (SMPTE), WMV version 9 was adopted for physical-delivery formats such as HD DVD and Blu-ray Disc and became known as VC-1. Microsoft also developed a digital container format called Advanced Systems Format to store video encoded by Windows Media Video.