Cambourne is a new settlement and civil parish in Cambridgeshire, England, in the district of South Cambridgeshire. It lies on the A428 road between Cambridge, 9 miles (14 km) to the east, and St Neots and Bedford to the west. It comprises the three villages of Great Cambourne, Lower Cambourne and Upper Cambourne. The area is close to Bourn Airfield.

Cambourne is the largest settlement in South Cambridgeshire, with a population of 12,350 in the 2021 UK census.

As part of plans to build thousands of new homes in the south-east of England, a new settlement on 400 hectares (990 acres) of former agricultural land, 9 miles (14 km) west of Cambridge, was considered in the late 1980s. In 1994, the Section 106 agreement from the Town and Country Planning Act 1990 was completed by the developers (McA), the local authority, Cambridgeshire County Council and the developers together with the landholders. The new settlement was to be constructed by three of Britain's larger builders of housing developments, Bovis Homes, Bryant Homes and Taylor Wimpey. Planning permission for the development at Monkfield Park was given in November 1996, and construction began in June 1998, on what was previously farmland.

In 2008, work began on building Upper Cambourne, with an original estimated completion date of 2012. The existing planning permission allowed 3,300 homes in the development. On 3 October 2011, planning permission was granted for a further 950 homes. This was set to take building work up to approximately 2016, and complete Upper Cambourne. In January 2017 outline planning consent was granted for a further 2,350 homes to the west of Lower Cambourne.

Cambourne was initially going to be named Monkfield after the name of the original farm, which is commemorated by a Monkfield Lane in Great Cambourne and the village pub, The Monkfield Arms. However, the name of the community was eventually created from the names of Cambridge, the nearest city, and Bourn, a nearby village.

The South Cambridgeshire (Parishes) Order 2004 created the new civil parish of Cambourne from 1 April 2004, and changed the boundaries of the Bourn parish.

Some facilities were built in Cambourne as part of the initial development. These included a Morrisons supermarket and petrol station, a medical practice, a dentist, a veterinary practice, allotments, a pub and a hotel.

The High Street in Cambourne has been developed further with a takeaway and eat-in food outlets, estate agents, a bookmaker, a building society branch, a dry cleaner, and a pharmacy. An initial summary of future plans for the High Street development was presented by Newcrest Developments at a Parish Council planning meeting on 24 January 2012. This suggested that a three-stage process could begin at the end of 2014, with a couple of larger retail units being built beside the Morrisons roundabout. Stage 2 could see a row of smaller shops and a larger convenience store located on land opposite The Monkfield Arms. The final stage could see a couple of medium-sized stores positioned on the barren land beside the medical practice. In April 2014, a planning application was submitted for a new 60-bedroom hotel, pub and small shop unit on open land at the entrance to Great Cambourne. In 2008, the local police force Cambridgeshire Constabulary announced the building of a new police station in the village, complementing the two other rural stations in Histon and Sawston, and two outposts at Melbourn and Linton, in South Cambridgeshire. Cambourne Police Station fully opened in September 2010.