Abstract : Acacia tortilis subsp. raddiana is a medicinal and forest phanerophyte in the Tindouf region (Western Sahara, Algeria). The species constitutes a particular entity and a capital element in the balance and maintenance of arid and desert ecosystems as well as in the fight against desertification. We carried out a questionnaire which lasted two months with the inhabitants and the herbalists. The different taxonomic parts of the species: roots, leaves, pods, gum exudates and bark are very useful for medical, pastoral and commercial purposes. In medicine, Acacia tortilis subsp. raddiana is useful for the treatment of skin allergies, diabetes, diuresis insufficiency and hypertension.