场效应管放大器（英语：FET amplifier）是一种使用场效应管（field-effect transistor (FET)）的放大器。在放大器应用中，场效应管的主要优点是它能提供非常高的输入阻抗以及低输出阻抗。

An FET amplifier is an amplifier which uses one or more field-effect transistors (FETs). The main advantage of an FET used for amplification is that it has very high input impedance and low output impedance. These are two desirable features for an amplifier.