This paper is based on examining a limited number of Arab–Berber sources whose main objective is to highlight that the Muslim West (Maghreb – al-Andalus) constituted a multilingual geographical space. First, I will look at the question of the Almoravids and the mastery of languages in a context of power. Then, I will raise the question of the linguistic skills of the sovereigns in al-Andalus. After this, I will give some details on the Berber language in the Marinid Maghreb. Finally, I will propose some brief conclusions of a provisional nature, emphasizing the interest of the study of linguistic uses and cultural contacts in the Muslim West in the Middle Ages.