| Official Name: | Tadjena |
| Settlement Type: | Commune and town |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Subdivision Type: | Country |
| Subdivision Name: |  Algeria |
| Subdivision Name1: | Chlef Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Abou El Hassan |
| Unit Pref: | Imperial |
| Utc Offset: | +1 |
Tadjena (Arabic: تدجنة) (formerly Fromentin) is a town in the Dahra mountains in Chlef Province in central Algeria, with a population of about 23,000; its altitude is 438 m.
The settlement of Tadjena was originally named after Eugene Fromentin, a French painter and poet who spent a lot of time in Algeria. The Tadjena massacre in 1997 occurred in two villages nearby.