South Fork Orestimba Creek is a tributary stream of Orestimba Creek, in the Diablo Range in Stanislaus County, California. Its mouth lies at an elevation of 673abbr=offNaNabbr=off at its confluence with North Fork Orestimba Creek where it forms the head of Orestimba Creek, itself a tributary of the San Joaquin River. Its source is at an elevation of 1550abbr=offNaNabbr=off at 37.1572°N -121.385°W in Henry W. Coe State Park.