The Hawazin (هوازن / ALA-LC: Hawāzin) were an Arab tribe originally based in the western Najd and around Ta'if in the Hejaz. They formed part of the larger Qays tribal group. The Hawazin consisted of the subtribes of Banu Sa'd, and Banu Jusham, as well as the powerful Banu Thaqif and Banu Amir, which were both often counted separately from the Hawazin.
The tribe often clashed with their one-time patrons, the Ghatafan, and on occasion, sub-tribes of the Hawazin fought each other. The tribe had little contact with the Islamic prophet Muhammad until 630 when they were defeated by Muhammad's forces at the Battle of Hunayn. The Hawazin tribe were one of the first to rebel and fight against the early Muslim state based in Medina during the Ridda wars, which followed Muhammad's death in 632.
According to oral tradition and genealogy studies, the modern-day tribe of Otaibah based in Saudi Arabia are descendants of the Hawazin.
The tribe formed part of the larger Qays Aylan group (also known simply as "Qays"). In the traditional sources, references to the Hawazin were often restricted to certain descendants of the tribe, known as ʿUjz Hawāzin (the rear of Hawazin); these subtribes were the Banu Sa'd, and Banu Jusham. The founders of these subtribes were either the sons of Bakr ibn Hawazin or the sons of Mu'awiya ibn Bakr ibn Hawazin. Two other major branches of the Hawazin, the Banu Amir ibn Sa'sa'a and the Banu Thaqif, were often grouped separately from the other Hawazin sub-tribes.
The Hawazin were pastoral nomads that inhabited the steppes between Mecca and Medina. Beginning around 550 CE, the Hawazin became a vassal tribe of the Banu 'Abs of Ghatafan under the 'Absi chieftain Zuhayr ibn Jadhima. When the latter was killed by the Banu 'Amir ibn Sa'sa' some years later, the Hawazin discontinued their tribute to Ghatafan. Sporadic battles and wars occurred in the following years, often between the bulk of the Hawazin, in alliance with the Banu Sulaym, on one side, and the bulk of the Ghatafan on the other.