The Hanbali school or Hanbalism is one of the four major schools of Islamic jurisprudence, belonging to the Ahl al-Hadith tradition within Sunni Islam. It is named after and based on the teachings of the 9th-century scholar, jurist and traditionist, Ahmad ibn Hanbal (c. 780–855 CE), and later institutionalized by his students. One who subscribes to the Hanbali school is called a Hanbali (Arabic: ٱلْحَنْبَلِيّ, romanized: al-ḥanbalī, pl. ٱلْحَنْبَلِيَّة, al-ḥanbaliyya, or ٱلْحَنَابِلَة, al-ḥanābila). It mostly adheres to the Athari school of theology and is the smallest out of the four major Sunni schools, the others being the Hanafi, Maliki and Shafi'i schools.
Like the other Sunni schools, it primarily derives sharia from the Quran, hadith and views of Muhammad's companions. In cases where there is no clear answer in the sacred texts of Islam, the Hanbali school does not accept juristic discretion or customs of a community as sound bases to derive Islamic law on their own—methods that the Hanafi and Maliki schools accept. Hanbalis are the majority in Saudi Arabia and Qatar where the Salafi movement has grown. As such, Hanbalis form barely 5% of the Sunni Muslim population worldwide.