Hadleigh Country Park is a country park in Hadleigh, Essex, England.

[2] Hadleigh Castle is adjacent but separate and managed by English Heritage.

The park is home to an Iron Age roundhouse, mountain biking trails, horse riding, a reservoir, conservation area, walking routes, a visitor centre and natural habitats.

[3] The park incorporates a wetland conservation area and salt marsh that is home to dragonflies.

[4][5] The park was the venue for mountain biking in the 2012 Summer Olympics.