Coordinates: 52°22′N 0°16′W / 52.36°N 0.26°W / 52.36; -00.26

Alconbury is a village in the English county of Cambridgeshire.

It is in the district of Huntingdonshire and gives its name to RAF Alconbury. It is near to the point where a major north/south road, the A1, crosses the only major east/west road: the A14. As of 2005 there are proposals to convert the airfield (now redundant) into a freight-only commercial airport to benefit from these surface links. Nearby to the east along the A14 are The Stukeleys: Great Stukeley and Little Stukeley. Little Stukeley is nearer to the former airfield than Alconbury. Just north of the A1/A14 junction is Alconbury Hill.

The church is dedicated to St Peter and St Paul. The Great North Road passed through the village and Alconbury Weston to the north-west. The A1 was dualled from Water Newton to Alconbury Hill in three stages in 1958. The £1.25m two mile A1 bypass opened in December 1964, joining the road at the point where it now meets the A14 (former A604) at the junction at the top of a hill. It followed part of the former A604. In November 1998, the bypass was converted into the A1(M) which terminates next of the village. The former road is partly the B1043 which is also part of the former A14 and the rest of the former A1 to Peterborough. Units of the US Air Force were based at Alconbury from 1942-1945, and then from 1953 to 1995.