Flow rate (interchangeable with 'flowrate') may refer to:
- Flow measurement, a quantification of bulk fluid movement
- Mass flow rate (ṁ or μ), the mass of a substance which passes per unit of time
- Volumetric flow rate ( or <math>\dot V</math>), the volume of fluid which passes per unit time
- Discharge (hydrology) (), volume rate of water flow that is transported through a given cross-sectional area, such as a river