Banu Lam (Arabic: بنو لام) is an Arab tribe of central Arabia and southern Iraq. The tribe claims descent from the ancient Arab tribe of Tayy. It has dominated western Nejd (the region between Medina and al-Yamama) before the 15th century. The tribe split into three main bedouin (nomadic) groups: the Fudhool, the Al Kathir, and the Al Mughira , and Al-Dhafeer. Many clans from Bani Lam, however, remained in Nejd as settled townspeople.