Nine Acres Pit is a 20.7-hectare (51-acre) geological Site of Special Scientific Importance north-east of Leighton Buzzard in Bedfordshire.

It was notified in 1986 under Section 28 of the Wildlife and Countryside Act 1981, and the local planning authority is Central Bedfordshire Council.

It is a Geological Conservation Review site.

[1][2] The site is a sand quarry which was worked by J. Arnold and Sons Limited in the late nineteenth century, and 9,516 tons were dug in 1897.

[3] According to Natural England: It is a working quarry and there is no public access.