Neutral Farm Pit, Butley is a 1.1-hectare (2.7-acre) geological Site of Special Scientific Interest in Butley, east of Woodbridge in Suffolk.

[1][2] It is a Geological Conservation Review site,[3] and is in the Suffolk Coast and Heaths Area of Outstanding Natural Beauty.

[4] This is described by Natural England as a classic site in the study of the Early Pleistocene in East Anglia.

It was used by the nineteenth-century geologist Frederick W. Harmer to define his Butley division of the Red Crag Formation, and it has many fossils of marine molluscs.

[5] There is access to the site from Mill Lane.