The Almohad Dynasty (Berber: Imweḥḥden, from Arabic al-Muwaḥḥidun, "the monotheists" or "the unitarians") is a Moroccan Berber-Muslim dynasty founded in the 12th century that establishes a Berber state in Tinmel in the Atlas Mountains in roughly 1120.

The movement is started by Ibn Tumart in the Masmuda tribe, followed by Abd al-Mu'min al-Gumi between 1130 and his death in 1163, the Almohads defeat the ruling Almoravids, extending their power over all of the Maghreb.

Al-Andalus (Islamic Iberia) under the Almoravid dynasty, follows the fate of Africa.

The Almohad dominance of Iberia continues until 1212, when Muhammad III, "al-Nasir" (1199–1214) is defeated at the Battle of Las Navas de Tolosa in the Sierra Morena by an alliance of the Christian princes of Castile, Aragon, Navarre, and Portugal.

Nearly all of the Moorish dominions in Iberia are lost soon after, with the great Moorish cities of Cordova and Seville falling to the Christians in 1236 and 1248 respectively.The Almohads continue to rule in Africa until the piecemeal loss of territory through the revolt of tribes and districts enables the rise of their most effective enemies, the Marinids in 1215.

The last representative of the line, Idris al-Wathiq, is reduced to the possession of Marrakesh, where he is murdered by a slave in 1269; the Marinids seize Marrakesh, ending the Almohad domination of the Western Maghreb.