Thurnby is a village and former civil parish, now in the parish of Thurnby and Bushby, in the Harborough district, in the county of Leicestershire, England. It is just east of Leicester's city boundaries.
Thurnby village proper is set to the south of the A47, just after it leaves the city. A sister village, Bushby lies just to the east and merges into it. To the west is Evington and Thurnby Lodge in Leicester proper, to the north is Scraptoft and to the south and east are open countryside – the next villages in these directions are Stoughton and Houghton on the Hill.