East Wood is a 6.6-hectare (16-acre) biological Site of Special Scientific Interest north of Great Casterton in Rutland.

[3] East Wood, Great Casterton was designated as a Site of Special Scientific Interest (SSSI) under Section 28 of the Wildlife and Countryside Act 1981 as being one of the best surviving examples in Central England of a semi-natural woodland.

The soil is composed of boulder clay of glacial origin over Middle Jurassic limestone from the Great Oolite Group.

Smaller trees and shrubs include hawthorn, hazel, spindle, common dogwood and privet.

In wetter parts of the wood, tufted hair-grass provides the main ground cover, but in drier areas there is a diverse flora characteristic of undisturbed ancient woodlands which includes wood anemone, primrose, sweet woodruff, yellow archangel and common violet, as well as a number of less common species which are seldom found in this area.