Bábism (a.k.a. the Bábí Faith; Persian: بابیه, romanized: Babiyye) is a religion founded in 1844 by the Báb (b. ʻAli Muhammad), an Iranian merchant turned prophet who taught that there is one incomprehensible God who manifests his will in an unending series of Manifestations of God. It has persisted into the modern era in the form of the Baháʼí Faith, to which the majority of Bábís eventually converted. His ministry was turbulent and short lived, ending with his public execution in Tabriz, and a campaign of extermination that killed thousands of followers in what might be the bloodiest actions of the Iranian military in the 19th century.

Throughout his ministry his titles and claims underwent much evolution as the Báb progressively outlined his teachings.

The Bábi Faith flourished in Iran until 1852, then lingered on in exile in the Ottoman Empire, especially Cyprus, as well as underground in Iran. An anomaly amongst Islamic messianic movements, the Bábí movement signaled a break with Shia Islam, beginning a new religious system with its own unique laws, teachings, and practices. While Bábism was violently opposed by both clerical and government establishments, it led to the founding of the Baháʼí Faith, whose followers consider the religion founded by the Báb as a predecessor to their own. Baháʼí sources maintain that the remains of the Bab were clandestinely rescued by a handful of Bábis and then hidden. Over time the remains were secretly transported according to the instructions of Baháʼu'lláh and then ʻAbdu'l-Bahá through Isfahan, Kermanshah, Baghdad, Damascus, Beirut, and then by sea to Acre on the plain below Mount Carmel in 1899. On 21 March 1909, the remains were interred in a special tomb, the Shrine of the Báb, erected for this purpose by ʻAbdu'l-Bahá, on Mount Carmel in present-day Haifa, Israel.

Those Bábís who did not convert to the Baháʼí Faith retained a community in Iran, also known as Azalis. They are estimated to be several thousand.