倚音（英语：Grace note），是一种装饰音。在乐谱上要标示倚音，该音则要比其它音小得多。

• 如该花音是长花音（意大利语：Appoggiatura），它可以是四分音符、十六分音符等不同长度的音符。
• 如该花音是短花音（意大利语：Acciaccatura），它会以带有斜线的八分音符作标示。短花音的长度比长花音短，对旋律的影响较少。
• 花音也可以由多个音组成。如该组花音是短花音，只有第一个音需要加斜线。

A grace note is a kind of music notation used to denote several kinds of musical ornaments, usually printed smaller to indicate that it is melodically and harmonically nonessential. When occurring by itself, a single grace note normally indicates the intention of either an appoggiatura or an acciaccatura. When they occur in groups, grace notes can be interpreted to indicate any of several different classes of ornamentation, depending on interpretation.