The Husaynids (Arabic: بنو حسين, romanized: Banū Ḥusayn) are a branch of the Alids who are descendants of Husayn ibn Ali, a grandson of the Islamic prophet Muhammad. Along with the Hasanids, they form the two main branches of the ashrāf.

Genealogical trees

Family tree of Husayn ibn Ali

Dynasties

• the various lines of Shi'a imams are largely Husaynid, being descended patrilineally from Husayn ibn Ali, the third imam. This applies to the Twelver Shi'a imams, the Zaydiyya, and the various lines of Isma'ili imams.
• the Isma'ili Fatimid dynasty and the later Aga Khans.
• a Zaydi dynasty, descended from Hasan al-Utrush, that intermittently ruled Tabaristan in the early 10th century
• the position of Sharif of Medina was in the hands of the Husaynid Banu Muhanna dynasty
• Al Qasimi of Sharjah and Ras Al Khaimah, United Arab Emirates
• The Houe of Hasib of Rajhat in Bihar are descendants from Syed Yaqub Halabi, a Qazi from Aleppo who travelled with Muhammad of Ghor to India.
• Jamalullail of Perlis, Malaysia
• Bendahara of Pahang and Terengganu, Malaysia
• Temenggong of Johor, Malaysia
• House of Ishaq of Somaliland, Djibouti, Ethiopia and Yemen