Church Run is a 4.0 mi (6.4 km) long 1st order tributary to Oil Creek in Crawford County, Pennsylvania.

Church Run rises on the Thompson Creek divide about 2 miles north of Titusville, Pennsylvania.

Church Run then flows southwest and south to meet Oil Creek at Titusville.

[2] Church Run drains 4.0 square miles (10 km2) of area, receives about 45.0 in/year of precipitation, has a topographic wetness index of 438.82, and has an average water temperature of 7.55 °C.

[4] The watershed is 66% forested.