Lake Taylorville is a 1,200-acre reservoir located in Christian County, Illinois. Created in 1962 by damming the South Fork of Illinois's Sangamon River, it was built for water supply and recreation purposes. The lake is 6.5 miles (10.5 km) long and 0.4 miles (0.6 km) wide. The nearest town is Taylorville, Illinois, southeast of Springfield, Illinois.
Lake Taylorville is managed by the city of Taylorville.
As with other Central Illinois reservoirs, Lake Taylorville is troubled by siltation, with an estimated 90,000 tons of silt annually eroding from farms in the lake's South Fork of the Sangamon catchment area and washing into the lake. The city in 1998 built a low-headed silt dam on Locust Creek, one of the reservoir's tributaries, to reduce lake siltation.