Bell is an incorporated city in Los Angeles County, California, near the center of the former San Antonio Township. Its population was 35,477 at the 2010 census, down from 36,664 in the 2000 census. Bell is located on the west bank of the Los Angeles River and is a suburb of the city of Los Angeles. At 2.5 square miles (6.5 km2), Bell is the thirteenth-smallest city in the United States with a population of at least 25,000.

The Los Angeles River, historically known as Paayme Paxaayt by the Tongva and the Río Porciúncula by the Spanish, is a major river in Los Angeles County, California. Its headwaters are in the Simi Hills and Santa Susana Mountains, and it flows nearly 51 miles (82 km) from Canoga Park through the San Fernando Valley, Downtown Los Angeles, and the Gateway Cities to its mouth in Long Beach, where it flows into San Pedro Bay. While the river was once free-flowing and frequently flooding, forming alluvial flood plains along its banks, it is currently notable for flowing through a concrete channel on a fixed course, which was built after a series of devastating floods in the early 20th century.