Perris is an old railway city in Riverside County, California, United States, located 71 miles (114 km) east-southeast of Los Angeles and 81 miles (130 km) north of San Diego. It is known for Lake Perris, an artificial lake, skydiving, Southern California Railway Museum, and its sunny dry climate. Perris is within the Inland Empire metropolitan area of Southern California. Perris had a population of 78,700 as of the 2020 census.

Native Americans inhabited the hills. Things changed when Spanish and Mexican miners entered the area.

The coming of the California Southern Railroad led to the founding of the city around the new depot, on the rail connection between the present-day cities of Barstow and San Diego.