Riverside is a city in Riverside County, California, United States, located in the Inland Empire metropolitan area. It is the county seat of the eponymous county and named for its location beside the Santa Ana River. It is the most populous city in the Inland Empire as well as Riverside County.

Riverside was founded in the early 1870s and is the birthplace of the California citrus industry as well as home of the Mission Inn, the largest Mission Revival Style building in the United States. It is also home to the Riverside National Cemetery.

The University of California, Riverside, is located in the northeastern part of the city. The university also hosts the Riverside Sports Complex. Other attractions in Riverside include the Fox Performing Arts Center, Riverside Metropolitan Museum, which houses exhibits and artifacts of local history, the California Museum of Photography, the California Citrus State Historic Park, and the Parent Washington Navel Orange Tree, the last of the two original navel orange trees in California.