South Luffenham is a village in the county of Rutland in the East Midlands of England. The population of the civil parish was 470 in 2021 increasing from 455 at the 2011 census.

The A6121 is a short cross-country road in the counties of Lincolnshire and Rutland, England. It forms the principal route between Bourne and Stamford and the A1 in Lincolnshire, continuing on through Ketton in Rutland to its junction with the A47 at Morcott. Its south-western end is at 52°35.5860′N 0°38.0820′W and its north-eastern end is at 52°45.9120′N 0°24.0660′W. The road has increased in importance with the rapid expansion of housing in this part of South Kesteven.