颤音琴（英语：Vibraphone，又可称为Vibraharp，简称Vibes），是打击乐器的一种。类似木琴，但琴键以金属制造，通常为黄铜或铝合金所造。琴键下设有共鸣管，最特别之处乃在各支管顶上加装了能转动的扇页，并且连接至琴身旁的马达。当供电及开启开关掣后，扇叶便能转动，导致共鸣管不断被开合。当敲打琴键时，声波震动空气传入共鸣管，扇页打开时便能免提及增加回音，但扇页关闭时音波则被阻挡，能进入共鸣管的音波大幅减少，所产生的共鸣和回音也较少。最终便产生出忽响忽暗的音色，「颤音琴」的名称就是这样而来。另外，颤音琴一般都会附有踏板，令琴键不会被止音垫止震，而令发音延长。

The vibraphone (also known as the vibraharp or simply the vibes) is a musical instrument in the struck idiophone subfamily of the percussion family.

The vibraphone resembles the xylophone, marimba, and glockenspiel. Each bar is paired with a resonator tube that has a motor-driven butterfly valve at its upper end. The valves are mounted on a common shaft, which produces a tremolo or vibrato effect while spinning. The vibraphone also has a sustain pedal similar to that on a piano. With the pedal up, the bars are all damped and produce a shortened sound. With the pedal down, they sound for several seconds.