| Subdivision Type: | Country |
| Pushpin Map: | Hungary |
| Pushpin Mapsize: | 300 |
| Coordinates: | 47.95°N 22°W |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Official Name: | Diósjenő |
| Subdivision Type1: | County |
| Subdivision Name1: | Nógrád |
| Area Total Km2: | 57.5 |
| Population As Of: | 2001 |
| Population Total: | 2803 |
| Population Density Km2: | 49 |
| Postal Code Type: | Postal code |
| Postal Code: | 2643 |
| Area Code: | 35 |
Diósjenő is a village in Nógrád county, Hungary. It is surrounded by hills.
The village was first mentioned in 1282. Its name comes from Jenő, the name of one of the seven tribes conquering present-day Hungary, while the word "diós" refers to walnut trees. The Hussites built a castle in the village. After the Ottoman era, in 1720 30 houses stood in the village.