持续音﹝意大利语：Tenuto，意指保持﹞，特指将某一音符奏得比较长，也有些演译是将此音奏得比较响，其标示为一横线，位于音符上方或下方，视乎音符的方向而定。

• 若持续音成串地出现，演奏家需要短促地及更响地奏出该组音符。
• 若一音符同时有持续音和加强音，该音的声量和长度皆需要增加。
• 若一音符同时有持续音和断音，该音具有圆滑而带跳动的效果。

Tenuto (Italian, past participle of tenere, "to hold") is a direction used in musical notation. It is one of the earliest directions to be used in music notation, as Notker of St. Gall (c.840 – 912) discusses the use of the letter t in plainsong notation as meaning trahere vel tenere debere in one of his letters.