North 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 South 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 3250abbr=offNaNabbr=off at 37.3436°N -121.4122°W on the north slope of the northern ridge of Black Mountain.