| Lahuen Ñadi Natural Monument | |
| Iucn Category: | III |
| Map: | Chile |
| Location: | Los Lagos Region, Chile |
| Nearest City: | Puerto Montt |
| Coordinates: | -41.409°N -73.0338°W |
| Coords Ref: | [1] |
| Area: | 2km2 |
Lahuen Ñadi Natural Monument is a 2km2 protected ñadi area in Los Lagos Region of southern Chile. It is located between Puerto Montt and Puerto Varas. Lahue Ñadi is one of the few places in the Chilean Central Valley where mature Fitzroya stands are preserved, some of them reaching ages of 1800 years.