Aldenham is a village and civil parish in Hertfordshire, north-east of Watford and southwest of Radlett. It was mentioned in the Domesday Book and is one of Hertsmere's 14 conservation areas. This secluded little village has eight pre-19th century buildings that are listed buildings and the parish itself is largely unchanged, though buildings have been rebuilt, since Saxon times when the majority of the land was owned by the abbots of Westminster Abbey.
In the Index of Multiple Deprivation, the ward of Aldenham East was ranked the least deprived ward out of 8414 in England, while Aldenham West also featured among the least deprived three per cent in the country. Radlett forms the eastern part of the civil parish.