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.

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