环戊酮（英语：Cyclopentanone）为一种有机化合物。无色液体，有类似薄荷油的气味。属于环酮类，结构上与环戊烷类似，均为五元环状结构，不过环戊酮分子中含有一个酮基。

性质稳定。可燃。吞食、吸入或皮肤吸收有害。对皮肤和呼吸道有刺激性，对眼部有强烈刺激作用。

Cyclopentanone is a cyclic ketone.

Upon treatment with barium hydroxide at elevated temperatures, adipic acid undergoes ketonization to give cyclopentanone.

Cyclopentanone is commonly used as a fragrance. It is a versatile synthetic intermediate, being a precursor to cyclopentobarbital and jasmone.