Threekingham is a village in the North Kesteven district of Lincolnshire, England. The population of the civil parish at the 2011 census was 233. It is situated on the A52 Grantham to Boston road, 6 miles (10 km) south from Sleaford, and close to the A15 Threekingham Bar roundabout. Mareham Lane, the Roman Road aligned with King Street, crosses the A15 at Threekingham.

The A52 is a major road in the East Midlands, England. It runs east from a junction with the A53 at Newcastle-under-Lyme near Stoke-on-Trent via Ashbourne, Derby, Stapleford, Nottingham, West Bridgford, Bingham, Grantham, Boston and Skegness to the east Lincolnshire coast at Mablethorpe. It is approximately 147 miles (237 km) long.