Obthorpe is a hamlet in the civil parish of Thurlby, in the South Kesteven district of Lincolnshire, England. It is situated 3 miles (5 km) south from Bourne, 6 miles (10 km) north-east from Stamford and less than 1 mile (1.6 km) west from the A15. Thurlby is the nearest village, 1 mile (1.6 km) to the north.