Leasingham is a village and civil parish in the North Kesteven district of Lincolnshire, England. It is situated less than 2 miles (3 km) north from Sleaford, and just off the A15. The hamlet of Roxholm lies to the north. The village has 713 households.The B1209 passes through the village to join the A153 further east, passing across Leasingham Moor. Close by to the west is RAF Cranwell.