Al-Jāmiʿah al-Ahliyyah Dār al-ʿUlūm Muʿīn al-Islām, popularly known as the Hāṭhazārī Madrasa or the Great Madrassah, is a Qawmi institution of Hathazari, located in Bangladesh's Chittagong District. Established in 1901, it is the largest and oldest Deobandi seminary in the country. According to a 2009 National Bureau of Asian Research report, the highly reputed institution ranks among top ten madrasa in the subcontinent.

Hathazari is an upazila of Chattogram District in Chattogram Division, Bangladesh.