Dunsby is a small village and civil parish in the South Kesteven district of in Lincolnshire, England. It is situated 4 miles (6.4 km) north from Bourne, just east off the A15, and on the western edge of the Lincolnshire Fens. In 2001 it had a population of 141, reducing to 122 at the 2011 census.
The Grade I listed parish church is dedicated to All Saints. Built of ironstone and limestone, it dates from the 12th century, and was restored in 1857.
The village cross is a medieval scheduled monument sited at a road junction in the village, and consists of the base and 8 inches (20 cm) of shaft.
Dunsby is mentioned in the Domesday book under the name of Dunesbe.