Afzal Makhdoum Pirmasti is a poet and biography writer from Herat, Bukhara (death: 1916). In the introduction of his Tadhkirah-ye Afzal alTazkar fi Zekr al-Sho’ ara va al-Ash’ ar, also known as Afzal’ s Biography of Poets he declares that he wrote the book by order of the emir of the Emirate of Bukhara, Abd al-Ahad Khan (1886-1910), in 1904 about 137 poets of Bukhara and the Persian speaking regions — who lived in Bukhara — from 1787/1788 until the year of compiling the book. There is little known about this author and his writing. The information about him in the sources in Afghanistan, Tajikistan, and Uzbekistan are not without errors. Thus, this study aims to introduce Afzal’ s Biography of Poets and critical ideas. To achieve this aim, the article seeks to find out who Afzal Makhdoum was, what his critical ideas about biography were, and what role his book had in Persian literary biography writing of Transoxiana. The findings show that Afzal’ s Biography of Poets is a piece of independent, regional, contemporary prose in the Persian language and that it played a significant role in the area and is considered as one of the main sources containing the biography of the 19th-and 20th-century poets of Transoxiana. His critical ideas could be classified into four categories: historical-interpretive, moral, socio-political, and rhetoric-aesthetic. However, it was written by the order of the emir. As a result, he considered the court and the personal interests of the emir in presenting critical views. Yet, due to the important role he played in reviving the names and works of his contemporary poets in Bukhara, he immediately attracted the attention of poetry and literature enthusiasts of this period so that his book has always been one of the main sources for researches on the literature of Bukhara and its related areas.