Abou Hassan ach-Chadhili (Arab: أبيالحسنالشاذلي), called Sidi Belhassen Echadly , born towards 1197 with the Morocco and deceased in 1258 in Egypt, is a Moroccan monk.

He is more known under the name of Sidi Belhassen. Considered to be a Sherif idrisside resulting from the line of Omar Ben Idris, he is in particular the ancestor of the Ghaïtiyin which resided at the country of the Ghomara and with Tadla. One their members more révéré in this last region was Abou Abdallah El Ghaït. It is of this branch of Ghaïtiyin that is originating Abou Hassan ach-Chadhili.

Called the “Imam of the believers”, Abou Hassan ach-Chadhili was a Moslem which founded the order esoteric Chadhiliyya which bears its name. At the 25 years age, taking the road of the East, he undertakes a voyage to Baghdad where it hastens to ask the address of the local mystical pole to meet a Master who would make it “return in the way”. It in what, a man of the name of Abou Hassan Wasti would have declared to him: “You seek Qotb of Iraq whereas it is in the country from where you come”. Going back to Morocco, he then becomes the disciple of Abdeslam Ben Mchich Alami which is regarded as its Master before this one does not require of him to go in Tunisia where he founds his own school.

He then becomes a ascetic always in Pèlerinage through the North Africa (in particular in Tunisia). He teaches his Doctrine with Tunis with a great success and attracts many disciples of which some become famous in their turn. Among his disciples, one can quote:

• Sidi Ali El Gorjani which gives his name to old a carries from Tunis and to a cemetery now unused.
• Sidi Mohammed El Chérif whose tomb is close to the mosque of El Haoua.
• Sidi Ali El Hattab which is buried in the plain of Mornaguia and whose tomb is a well-known place of pilgrimage of the Tunisians.
• Sidi Hassen El Séjoumi which has its Zaouïa close to the Sebkha of the same name.
• Saïda Baited Manoubia or Lella Manoubia which is regarded as a Saint E in Tunis.

During one of its voyages to Mecque, it brings back the use of the Décoction Graine S of Caféier so that its disciples can be held waked up during the exercises of night Piété which it recommends. He is thus regarded as the inventor of the use of the Café in Tunisia. At a certain time, he elects residence in one of the Grotte S of the hill which bears its name today. But its popularity carries shade to the capacity and, perhaps under the instigation of the Ouléma S, it is forced to exile itself. It is withdrawn in Egypt where it dies in 1258.

After its departure of Tunis, its disciples meet in a Confrérie, which is organized under the name of Chadhiliyya, and which one can see both Zaouïa S at the top of the hill of Sidi Belhassen. ----