Hilyat al-Awliya' wa Tabaqat al-Asfiya' (Arabic: حلية الأولياء وطبقات الأصفياء, romanized: The Ornament of God's Friends and Generations of Pure Ones)[1] is a biographical encyclopaedic book authored by Abu Nu'aym al-Isfahani.

[2] The Hilyat al-Awliya' is recognized as one of the most important sources for the early development of Sufism,[3] as it contains the largest known collection of biographies of Sufis.

They include, in roughly chronological order: the first generation of Muslims specifically the four rightly guided caliphs, the first six Imams according to the Shia theology, the eponymous founders of the three of the four major Sunni schools of jurisprudence, theologians and pious people known for their ascetism, piety and mysticism.

The author gets involved in sensitive subjects and refutes heresy that contradict the tenets of the Islamic faith.

[2] Ibn al-Jawzi criticized the author for including the Companions of the Prophet, so then he went on to make his own version of book in two volumes entitled Sifat al-Safwa; in it, he attempts to avoid the words using "Sufi" or "Tasawwuf.