矿石收音机，简称矿石机，是利用天然矿石或晶体二极管作为检波组件，加上天线、地线、调谐电路和耳机等制成的收音机。

第一次由Greenleaf Whittier Pickard在大约1900年制造，并且使用条形晶体矿石来探测无线电信号。

人们第一次制造和使用了简单低价的矿石收音机不需要电池或电能。即使在第一次世界大战之后电子管收音机被普遍使用, 矿石收音机依旧非常流行, 特别是在初级业余无线电爱好者和学生当中。他们制作矿石收音机以学习基本的电子和通信知识。

A crystal radio receiver, also called a crystal set or cat's whisker receiver, is a very simple radio receiver, popular in the early days of radio. It needs no other power source but that received solely from the power of radio waves received by a wire antenna. It gets its name from its most important component, known as a crystal detector, originally made from a piece of crystalline mineral such as galena. This component is now called a diode.