WMA（Windows Media Audio）是微软公司开发的一种数字音频压缩格式。一些使用Windows Media Audio编码格式编码其所有内容的纯音频ASF文档也使用WMA作为扩展名。

WMA格式最初为微软公司所开发，但是随着苹果公司的iTunes对它的支持，这个格式正在成为MP3格式的竞争对手之一。它兼容MP3的ID3元数据标签，同时支持额外的标签。

另外，一般情况下相同音质的WMA和MP3音频，前者文档体积较小；「Windows Media Audio Professional」可以保存5.1甚至7.1声道的音乐，而且音质可媲美Dolby Digital（杜比数码）。

Windows Media Audio (WMA) is the name of a series of audio codecs and their corresponding audio coding formats developed by Microsoft. It is a proprietary technology that forms part of the Windows Media framework. WMA consists of four distinct codecs. The original WMA codec, known simply as WMA, was conceived as a competitor to the popular MP3 and RealAudio codecs. WMA Pro, a newer and more advanced codec, supports multichannel and high resolution audio. A lossless codec, WMA Lossless, compresses audio data without loss of audio fidelity (the regular WMA format is lossy). WMA Voice, targeted at voice content, applies compression using a range of low bit rates. Microsoft has also developed a digital container format called Advanced Systems Format to store audio encoded by WMA.