低音巴松管（英文: Contrabassoon, double bassoon）是巴松管的变形乐器，属于双簧乐器，音域较巴松管低1个八度，是交响乐队木管乐器组中音域最低的乐器。演奏技巧除了少部份的指法外，大致和巴松管相近。在现代的交响乐团中，一般都有至少一位巴松管手同时演奏巴松管及低音巴松管。而演奏现代作品或者需运用较大乐队规模的乐曲（如马勒、理察．史特劳斯、萧士塔高维契等）时，更需要一位独立的低音巴松管手。

The contrabassoon, also known as the double bassoon, is a larger version of the bassoon, sounding an octave lower. Its technique is similar to its smaller cousin, with a few notable differences.