Sacramento RT Light Rail is a 42.9-mile (69.0 km) light rail system that serves the Sacramento, California area. It consists of three rail lines, 53 stations, and a fleet of 96 vehicles. It is operated by the Sacramento Regional Transit District (RT). With an average of 22,200 weekday daily boardings as of the fourth quarter of 2023, the RT light rail system is the thirteenth busiest in the United States.

The Sacramento Regional Transit District, commonly referred to as SacRT, is the agency responsible for public transportation in the Sacramento, California area. It was established on April 1, 1973, as a result of the acquisition of the Sacramento Transit Authority. In addition to operating over 81 bus routes with connecting bus service in the Sacramento area covering 438 square miles (1,134.4 km2), SacRT also operates a large light rail system, which ranks currently as the thirteenth busiest light rail system in the United States. In 2023, the system had a ridership of 15,836,400, or about 56,600 per weekday as of the fourth quarter of 2023.