体积流率（volume flow rate）是在流体力学及水力学中的物理量，是指单位时间通过特定表面的流体体积，常用大写字母Q表示。国际标准制的单位为m s。英制下的体积流率单位为ft/s。

体积流率和体积通量不同。后者是指单位截面积下的体积流率，常用小写字母q表示，国际标准制的单位为m/(m s)=m s。将一截面积下的体积通量对面积积分，即可得到体积流率。达西定律常用来说明流体在多孔物质下的体积通量。

In physics and engineering, in particular fluid dynamics and hydrometry, the volumetric flow rate, (also known as volume flow rate, rate of fluid flow or volume velocity) is the volume of fluid which passes per unit time; usually represented by the symbol Q (sometimes V̇). The SI unit is m/s (cubic metres per second). Another unit used is sccm (standard cubic centimeters per minute).