Hatley is a civil parish in South Cambridgeshire, England. It lies between the villages of Gamlingay and Croydon, 12 miles south-west of the city of Cambridge and eight miles south-east of the town of St Neots. In 2001, the population of Hatley parish was 205 people living in 77 households, reducing at the 2011 Census to a population of 181 in 78 households.