An independent body of literature has developed in the history of the Ottoman Sufism. This is known as tājnāme and deals, in general, with all the components of the dervish apparel. This literature focuses, in particular, on the tāj-ı sharīf which is worn by the sheikhs, their successors (khalifas) and hizmetnishins who have reached a certain level of sayr al-sulūk, from both the exoteric (zāhirī) and esoteric (bātınī) aspects. This paper consists of two parts. After having examined the nature of the dervish tāj, its religious roots, historical journey, and etiquette, as well as the different styles of the tāj, its sections and symbolism with reference to the Ottoman tājnāme literature, the first part deals with the analysis of the Turkish tājnāme treatise named Jawāhir-i Tāj-ı Khilāfet written by Abdullah Salāh al-Dīn al- Ushshākī (1175-1197/1765-1783). al-Ushshākī was a leading sufi in 18th century and his treatise explains the symbolism of the dervish tāj in the most detailed manner. This treatise dwells on the sufi symbolism of the Halwatī tāj in general and Ushshākī tāj in particular, its four terk, the five or seven branches in the terk, the colour of the tāj, the button and shamla as well as the dervish’s cloak, clothes and the spectre. The second part of the paper is a critical edition of al-Ushshākī’s treatise.