响度战争或音量竞赛（英文：loudness war 或 loudness race）指的是混音业（特别是唱片公司及广告界）中将母带的音量提升，最早的是简单地增加波形的振幅，但发展到后期声音技师以越来越暴力的手段压缩音波以收窄整条声音的动态范围，再将音波振幅按整体比例向上推。这「竞赛」的发端是业界的艺人或制作人要求自己作品的音量比其他业者突出（例如在播放电视广告时段），行家们互相竞争而造成作品音量逐年有增无减，直到音波压无可压为止。

"Loudness war" or "loudness race" is the popular name given to the trend of increasing audio levels in recorded music since the early 1990s, which many critics believe reduces sound quality and listener enjoyment. Increasing loudness was first reported as early as the 1940s with respect to mastering practices for 7" singles. The maximum peak level of analog recordings such as these is limited by varying specifications of electronic equipment along the chain from source to listener, including vinyl record and cassette players.