漂移速度(Drift Velocity)，是指一个粒子(例如电子)因为电场的关系而移动的平均速度。

实际上，当没有电场存在，导体中的电子以费米速度作随机移动。

电场使这个随机运动过程获得单一方向的净速度。

因为电流和漂移速度成正比，经多番推导后可得出其量值亦和电场量值成正比例，当中的推导过程可以欧姆定律解释。

漂移速度可以用以下公式表达：

The drift velocity is the flow velocity that a particle, such as an electron, attains in a material due to an electric field. It can also be referred to as axial drift velocity. In general, an electron will propagate randomly in a conductor at the Fermi velocity. An applied electric field will give this random motion a small net flow velocity in one direction.