Wildcat Canyon is a canyon and tributary stream of South Fork Pacheco Creek in Santa Clara County, California. Its source is in the Diablo Range in San Benito County, California. Its source is a spring at an elevation of 2560abbr=offNaNabbr=off, on the southwest slope of Mariposa Peak (3,448 feet) near its summit at 36.9542°N -121.2144°W. Its mouth is at its confluence with South Fork Pacheco Creek at an elevation of 1388abbr=offNaNabbr=off.