Abdullah Fa'izi al-Daghestani (December 14, 1891 – September 30, 1973), commonly known as Shaykh Abdullah, was a Dagestani shaykh of the Naqshbandi-Haqqani Sufi order.
He was born in the Caucasian region of Dagestan, then part of the Russian Empire, in 1891. Both his father and elder brother were medical doctors, the latter being a surgeon in the Imperial Russian Army. Shaykh Abdullah was raised and trained by his maternal uncle, Shaykh Sharafuddin Daghestani (1875–1936).
In the late 1890s Shaykh Abdullah's family emigrated to the Ottoman Empire, following his uncle shaykh Sharafuddin who had emigrated in the 1870s. They settled in the northwestern Anatolian city of Bursa and then, after a year, moved to Reşadiye, now known as Güneyköy, Turkey. A new village was established that was populated by Dagestani refugees. Shortly thereafter, Shaykh Abdullah’s father died, and at the age of fifteen, he married a Dagestani named Halima.
In 1910, after merely six months of marriage, Shaykh Sharafuddin ordered Abdullah into sacred seclusion (khalwat) for five years. This practice included severe austerities that were intended to raise his spiritual rank. When Abdullah returned to secular life the Ottoman Empire was embroiled in the First World War. Along with many young men of his village, Abdullah entered military service and took part in the Battle of Gallipoli. During a firefight he was severely wounded by enemy fire.
In 1921, Abdullah was instructed by Shaykh Sharafuddin to enter another five years seclusion. He completed this and was then granted a license, or ijazah, to be a master, or shaykh, in the Naqshbandi order.
Because of anti-Sufi regulations in the new Turkish Republic, Shaykh Abdullah began to contemplate leaving the country. After the death of Shaykh Sharafuddin in 1936, a delegation came to Reşadiye from King Farouk to pay their condolences, as he had many followers in Egypt. One of Shaykh Abdullah's daughters married a member of the delegation. Shaykh Abdullah and the family then moved to Egypt, though they would remain there for only half a year as the marriage soon ended in divorce.
Following his daughter's divorce, Shaykh Abdullah and his family then moved to Syria where he would remain for the rest of his life. He resided for a time in Aleppo, moved to Homs and then finally to Damascus near the tomb of saint Sa’d ad-Din Jibawi. There, he established the first tekke for his branch of the Naqshbandi order.
In 1943, he moved to a house on Jabal Qasioun mountain. The house was bought by his first Syrian murid and later one of his deputies in the Sufi order, Shaykh Husayn Ifrini. This house is now the site of his burial shrine and its adjoining mosque.
Shaykh Abdullah died on September 30, 1973 in Beirut, Lebanon. His grave and burial shrine is in Damascus, Syria, at the site of his former home and mosque on Jabal Qasioun mountain.
Among his notable followers were the Sufi shaykhs Nazim al-Haqqani, Husayn Ifrini, Hisham Kabbani, and Adnan Kabbani. One of his successors, Shaykh Nazim, went on to spread this branch of the Naqshbandi Sufi order to many countries in the world and was considered among the world's most influential Muslims.
An internet rumor claims that the Dagestani Sufi shaykh Said Afandi al-Chirkawi (d. 2012), former head of another branch of the Naqshbandi Sufi path, denied the legitimacy of the ijaza, or authorization, of Shaykh Abdullah's teacher, Shaykh Sharafuddin. This is unsupported by what Shaykh al-Chirkawi has actually written on the matter