The Ibāḍī movement, Ibadism or Ibāḍiyya (Arabic: الاباضية al-Ibāḍiyyah) is a form of Islam distinct from the Sunni and Shia denominations. It is the dominant form of Islam in Oman and Zanzibar. Ibadis can also be found in Algeria, Tunisia, East Africa as well as Libya.

Believed to be an off-shoot of one of the earliest schools, Khawarij, it is said to have been founded less than 50 years after the death of the prophet Muhammad. Historians as well as majority of Muslims believe that the denomination is a reformed Islamic sect, formally known as the Khawarij or Kharijites. However, Ibadis continue to deny any but a passing relation to the Kharijites (Khawarij), and point out that they merely developed out of the same precursor group; and whilst they may hold some beliefs in common, they and the Kharijites were never one and the same.

The school derives its name from Abdullah ibn Ibadh at-Tamīmī. However, the true founder was Jabir ibn Zaid al-'Azdi from Nizwa, Oman.

Ibadi communities are generally regarded as conservative, for example Ibadiyya rejects the practice of qunut or supplications while standing in prayer.