量筒是实验室中使用的一种量器，主要用玻璃，少数（特别是大型的）用透明塑料制造。用途是按体积定量量取液体，但不可在量筒里混合试剂、进行化学反应。

为竖长的圆筒形，上沿一侧有嘴，便于倾倒。下部有宽脚以保持稳定。圆筒壁上刻有容积量程，供用户读取体积。最大衡量容积从几毫升到几升。筒壁自下而上印有刻度。观察读数时，实验人员要注意视线需要与液体的凹液面的最低处（或凸液面的最高处）相平。

用来测液体体积的容器还有刻度吸管和滴管，二者都比量筒的准确性高。但一只刻度吸管只能量取固定量的溶液，而滴管使用上比较繁琐。

A graduated cylinder, measuring cylinder or mixing cylinder is a common piece of laboratory equipment used to measure the volume of a liquid. It has a narrow cylindrical shape. Each marked line on the graduated cylinder represents the amount of liquid that has been measured.