A Hawza (Arabic/Persian: حوزة) or ḥawza ʻilmiyya (Arabic/Persian: حوزة علمیة) is a seminary where Shi'a Muslim clerics are trained.
Several senior Grand Ayatollahs constitute the hawza. The institutions in Najaf, Iraq and Qom, Iran, are the preeminent seminary centers for the training of Shi'a clergymen. However, several smaller hawzas exist in other cities around the world, such as at Karbala, Iraq, Isfahan and Mashhad in Iran, Beirut, Lebanon, Lucknow, India, Lahore, Pakistan, Europe and North America.
Hawza 'Ilmiyya in Najaf, Iraq was established in 430 AH (the 11th century AD) by Shaykh al-Tusi (385 AH/995 CE – 460 AH/1067 CE), and continued as a center of study until the establishment of modern Iraq in 1921. At present Ayatollah Sistani heads Hawza 'Ilmiyya Najaf, which includes three other Ayatollahs - Mohammad Ishaq Al-Fayyad, Mohammad Saeed Al-Hakim and Bashir al-Najafi. After witnessing a peak of some 20,000 students in the 60s, then around 3000 because of the State repression, since 2003, the Najaf hawza has now more than 13,000 students, while the curriculum has been updated to include many modern subjects as well as inter faith and inter sectarian initiatives.