音域是指某一乐器或人声歌唱所能发出的最低音到最高音之间的范围。

不同的乐器有高低宽窄不同的音域，较多数的乐器如管乐器、弦乐器在演奏音域边缘的声音时会比较困难，键盘乐器或打击乐器则较无这类问题，因此通常可以有较宽广的音域。

In music, the range of a musical instrument is the distance from the lowest to the highest pitch it can play. For a singing voice, the equivalent is vocal range. The range of a musical part is the distance between its lowest and highest note.

The terms sounding range, written range, designated range, duration range and dynamic range have specific meanings.