移液器（英语：pipette, pipet, pipettor 或 chemical dropper），又称「定量吸管」、「移液管」、「吸量管」，港台地区口语上常以英语名称来称呼。是一种实验室器材，专门用来量测液体体积，并将其吸取以滴入其他容器。常使用于生物学实验或化学实验。通过多种设计来实现不同的准确与精密度，包括从简单的一片玻璃制作的吸管，到复杂的可调的或电控的吸管。 许多移液管可使液面上方容器形成局部真空，并通过选择性地调节真空体积来吸取或排出液体。其测量的准确度因种类不同而差别巨大。

A pipette (sometimes spelled pipet) is a laboratory tool commonly used in chemistry, biology and medicine to transport a measured volume of liquid, often as a media dispenser. Pipettes come in several designs for various purposes with differing levels of accuracy and precision, from single piece glass pipettes to more complex adjustable or electronic pipettes. Many pipette types work by creating a partial vacuum above the liquid-holding chamber and selectively releasing this vacuum to draw up and dispense liquid. Measurement accuracy varies greatly depending on the style.