Hexton Chalk Pit is a 1.9-hectare (4.7-acre) nature reserve in Hexton in North Hertfordshire, managed by the Herts and Middlesex Wildlife Trust.
It is grassland with steep slopes and many chalk-loving plants such as horseshoe vetch, yellow-wort, milkwort and rockrose.
There are five species of orchid and a large colony of chalkhill blue butterflies.
[1] The reserve is on the left of the road signposted "Lilley" from Hexton.
There is also access by a footpath, signposted "circular walk", from Barton Hill Road, close to the Icknield Way Path.