In Islamic tradition, the term Mujaddid refers to a person who is appointed by Allah in the first half of every century of the Islamic calendar. His objective is to reform Islam of any extraneous elements and restore it to its pristine state.

The appointment of a Mujaddid is referred to in Qur'an and Hadith:

"Allah has promised to those of you who believe, and do good, that He will surely make them khalifas in the earth as He made those before them to be khalifas " (Qur'an 24:55)

"Surely Allah will raise up for the Muslims, at the head of every century, one who will revive their religion." (Abu Dawood)

"The Israelites used to be led by prophets; whenever a prophet died, another came after him. After me there is no prophet, but there will be khalifas and there will be many." (Bukhari, book 60, ch. 50)

List of Past Mujaddids:

1. Hazrat Umar ibn Abdul Aziz
2. Hazrat Imam Shafi & Hazrat Imam Ahmed ibn Hanbal
3. Hazrat Abul Hassan Ash'ari & Hazrat Abu Sharh
4. Hazrat Abu Ubaid Naishapuri & Hazrat Qazi Abu Bakr Baqlani
5. Hazrat Imam Al-Ghazali
6. Hazrat Sayyid Abdul Qadir Gilani
7. Hazrat Mueenuddin Chishti & Hazrat Imam ibn Taimiyya
8. Hazrat Hafiz ibn Hajar Asqalani & Hazrat Saleh ibn Umar
9. Hazrat Sayyid Muhammad Jaunpuri
10. Hazrat Imam Jalaludin Sayuti
11. Hazrat Mujaddid Alif Sani
12. Hazrat Shah Waliullah Muhaddith Dehlavi
13. Hazrat Sayyid Ahmad Brelvi
14. Hazrat Mirza Ghulam Ahmad (claim disputed)