The Aït Hadiddou are a Berber tribe of the central High Atlas of Morocco, inhabiting the high valleys of the Asif Melloul and Asif n Ouarkennas around the lake of Isli and the village of Imilchil. Their language is the central variety of Tamazight (Tamazight n waṭlas).
The tribe is traditionally divided into two principal moieties — the Aït Brahim and the Aït Yazza — segmented further into clans across the surrounding pastures. Customary law (azref) governs pasture rotation, marriage, and feud. The Aït Hadiddou are part of the broader Aït Yafelman federation of the central High Atlas.
The tribe is internationally known for the late-summer Imilchil betrothal moussem at the lake of Isli, where customary collective engagements are celebrated alongside the regional livestock fair. The institution is older than its current touristic visibility; ethnographic work since the 1970s has documented its evolving relationship to wider Moroccan and global circuits.
Subsistence has historically combined transhumant pastoralism — sheep and goats moved between the high pastures of the Plateau des Lacs in summer and the lower valleys in winter — with cereal cultivation in the irrigated bottomlands. The contemporary population is increasingly settled, with growing seasonal labour migration to Beni Mellal, Khenifra, and Casablanca.