The Qadiriyya (Arabic: القادريه, Persian:قادریه, also transliterated Qadri, Qadriya, Kadri, Elkadri, Elkadry, Aladray, Adray, Kadray, Qadiri or Qadri), are members of the Qadiri Sufi order (tariqa). This derives its name from Syed Abdul Qader Gilani Al Amoli (1077–1166 CE, also transliterated as "Jilani" etc.) who was a native of the Iranian province of Mazandaran. The order relies strongly upon adherence to the fundamentals of Islam. Common names for descendants of this order include Balochi Qadri and Ahmed Qadri. The Qadri are all Sufis.

The order, with its many offshoots, is widespread, particularly in the Arabic-speaking world, and can also be found in Turkey, Indonesia, Afghanistan, India, Bangladesh, Pakistan, the Balkans, Israel, China,East and West Africa. A few famous travelers and writers such as Isabelle Eberhardt also belonged to the Qadiri order.^{[citation needed]}

The founder of the Qadiriyya, Abdul-Qadir Gilani, was a respected scholar and preacher. Having been a pupil at the school (madrasa) of Abu Sa'id al-Mubarak Mukharrami he became leader of this school after Mukharrami's death in 1119 CE. Being the new shaykh, he and his large family lived comfortably in the madrasa until his death in 1166, when his son, Abdul-Wahhab, succeeded his father as sheikh. At the time the Sufi tradition of Abu Hafs Umar al-Suhrawardi was gaining prominence after the caliph al-Nasir came to power in 1180 and patronised al-Suhrawardi. Gilani's son, Abdul al-Razzaq, published a hagiography of his father, emphasising his reputation as founder of a distinct and prestigious Sufi order.