Greenville Creek is a 44.4-mile-long (71.5 km)[4] tributary of the Stillwater River in southwestern Ohio in the United States.

It soon flows into Darke County, Ohio, and joins with a tributary that also starts in Indiana, Dismal Creek.

Near its confluence with the Stillwater River at Covington it drops 20 feet (6.1 m) at Greenville Falls in a glacially-cut gorge that is a state nature preserve.

[5] A USGS stream gauge on the creek near Bradford recorded a mean annual discharge of 192.8 cubic feet per second (5.46 m3/s) during water years 1931–2019.

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