Hamallayya or Hamallism is a sufi ṭarīqah (order, path) originating in West Africa as an outgrowth from and reaction against the Tijaniyyah brotherhood. It was founded at the beginning of the 20th century by a mystic Muhammad ben Amadu (d. 1909) of Maure and Fulani background, as reform movement of Tijaniyyah practice. Stressing opposition to hierarchy and downplaying the importance of education, the movement spread in the 1920s by Amadu's disciple Shaykh Hamahullah bin Muhammad bin Umar (1886–1943) in what was then French Soudan, modern Mali. It first took root amongst Wolof traders living in Nioro, but soon spread to servile caste Muslims in Mauretania and Mali.

Hammallist doctrinal changes from Tijaniyyah ritual included the removal of some recited references to the Prophet, rejecting Koranic study, and the shouting of prayers in group worship. Hammallists tended to stress traditional West African ritual and the rejection of traditional hierarchies, including gender, age, and caste distinctions.