Cambridgeshire County Top

Great Chishill is a village and former civil parish, now in the parish of Great and Little Chishill, in the South Cambridgeshire district, in the county of Cambridgeshire, England. The village is about 1 mile (1.6 km) east of the county boundary with Hertfordshire and about 4 miles (6 km) east of Royston. In 1961 the parish had a population of 293. The 2011 Census recorded Great and Little Chishill's population as 678.

The parish was part of Essex until 1895, when the county boundary was revised. On 26 January 1929 the parish was renamed from "Great Chishall" to "Great Chishill". On 1 April 1968 the parish was abolished to form "Great and Little Chishill".

The highest point of the current administrative county of Cambridgeshire, 146 m (479 ft) above sea level, is about 1⁄2 mile (800 m) east of St Swithun's parish church. However, as Great Chishill was historically a part of Essex (having been moved in boundary changes in 1895), the historic county top of Cambridgeshire is about 13 miles (21 km) to the east of Great Chishill close to the village of Castle Camps where a point on the disused RAF airfield reaches a height of 128 metres (420 ft) above sea level (grid reference TL 63282 41881).

The highest point of Essex, Chrishall Common and the triple point of Cambridgeshire, Essex and Hertfordshire are near each other about 1.2 miles (2 km) south of Great Chishill.