皮尔斯震荡器（Pierce oscillator，或称皮尔斯晶体震荡器）是一种电子振荡电路，特别适用于配合石英振荡晶体以产生振荡信号。得名于发明者：乔治·皮尔斯（George W. Pierce，1872-1956）。

皮尔斯震荡器衍生自考毕子振荡器。现今使用石英晶体进行振荡以产生时钟信号的数字电路，几乎均使用皮尔斯震荡器电路，因为它电路简单，工作有效而稳定，优于其它型态的石英晶体振荡电路。 皮尔斯震荡器所需零件很少: 一个反相器、一个电阻、一个石英晶体、两个小电容。石英晶体在此扮演高选择度的滤波组件。 此外，很多 IC 已内置反相器与电阻，只要在外部加上石英晶体与两个电容就可以工作。 由于石英晶体频率稳定，此电路成本又很低，因此广泛用于各种消费电子产品之中～

The Pierce oscillator is a type of electronic oscillator particularly well-suited for use in piezoelectric crystal oscillator circuits. Named for its inventor, George W. Pierce (1872-1956), the Pierce oscillator is a derivative of the Colpitts oscillator. Virtually all digital IC clock oscillators are of Pierce type, as the circuit can be implemented using a minimum of components: a single digital inverter, two resistors, two capacitors, and the quartz crystal, which acts as a highly selective filter element. The low manufacturing cost of this circuit, and the outstanding frequency stability of the quartz crystal, give it an advantage over other designs in many consumer electronics applications.