| Aldenham Reservoir | |
|---|---|
 Lake at Aldenham Country Park | |
  Aldenham Reservoir  Aldenham Reservoir | |
| Location | Hertfordshire |
| Coordinates | 51°38′45″N 0°18′40″W / 51.64583°N 0.31111°W |
| Type | reservoir |
| Basin countries | United Kingdom |
| Surface area | 55 acres (220,000 m2) |
Map showing the location of Aldenham Reservoir within Hertfordshire.
Aldenham Reservoir is situated in the parish of Elstree and Borehamwood in Hertfordshire, England, about one mile (1.6 km) to the west of the village of Elstree.
It is the source of the stream, Tykes Water, that runs north through Radlett.