San Timoteo Creek (also called San Timoteo Wash, colloquially known as San Tim) is a stream in Riverside and San Bernardino counties in southern California, United States. A tributary of the Santa Ana River, it flows through San Timoteo Canyon. San Timoteo Creek has a drainage basin of about 125 square miles (320 km2). The creek receives most of its water from headwater tributaries flowing from the San Bernardino Mountains near Cherry Valley, as well as , which flows from . The name "San Timoteo" was given to the creek and canyon around 1830. It is Spanish for Saint Timothy.