In hydrology, a current in a water body is the flow of water in any one particular direction. The current varies spatially as well as temporally, dependent upon the flow volume of water, stream gradient, and channel geometry. In tidal zones, the current and streams may reverse on the flood tide before resuming on the ebb tide. On a global scale, wind and the rotation of the earth greatly influence the flow of ocean currents.^[1]

In a stream or river there the current is influenced by gravity, the term upstream (or upriver) refers to the direction towards the source of the stream (or river), i.e. against the direction of flow. Likewise, the term downstream or downriver describes the direction towards the mouth of the stream or river, in which the current flows. The term "left bank" and "right bank" refers to banks as seen from the direction of flow, towards the downstream direction.^[2]

• Discharge (hydrology) – Flow rate of water that is transported through a given cross-sectional area
• Ocean current – Directional mass flow of oceanic water
• Rheoscope – Instrument for measuring fluid viscosity
• Rheotaxis
• Rip current – Water current moving away from shore
• Volumetric flow rate – Volume of fluid which passes per unit time

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