Lake Elsinore is a city in western Riverside County, California, United States. Established as a city in 1888, it is on the shore of Lake Elsinore, a natural freshwater lake about 3,000 acres (1,200 ha) in size. The city has grown from a small resort town in the late 19th and early 20th centuries to a suburban city with over 70,000 residents.

Native Americans have long lived in the Elsinore Valley. The Luiseño people were the earliest known inhabitants. Their pictographs can be found on rocks on the Santa Ana Mountains and in Temescal Valley, and artifacts have been found all around Lake Elsinore and in the local canyons and hills.