Siyah Kalem or 'Black Pen' is the name given to the 15th century school of painting attributed to Mehmed Siyah Kalem. Nothing is known of his life; but his work indicates that he was of Central Asian Turkic origin; and thoroughly familiar with camp and military life. The paintings appear in the 'Conqueror's Albums'; so named because two portraits of Sultan Mehmed II the Conqueror are present in one of them.

The albums are made up of miniatures taken from manuscripts of the 14th; 15th; and early 16th centuries; and one series of paintings is inscribed 'work of Master Mu?ammad Siyah Kalem'. Something of the style and techniques of Chinese paintings is apparent in these; and an acquaintance with Buddhist art; particularly in the depictions of grotesque demonic figures.