缓冲放大器（英语：buffer amplifier，有时简称缓冲器），是一种在一个电路与另一个电路之间提供阻抗变换的设备。缓冲放大器主要包括电压缓冲器和电流缓冲器。

A buffer amplifier (sometimes simply called a buffer) is one that provides electrical impedance transformation from one circuit to another. Two main types of buffer exist: the voltage buffer and the current buffer.