The Dehkhoda Dictionary (Persian: لغت‌نامهٔ دهخدا‎) is the largest comprehensive Persian encyclopedic dictionary ever published, comprising 200 volumes. It is published by the Tehran University Press (UTP) under the supervision of the Dehkhoda Dictionary Institute. It was first published in 1931. It traces the historical development of the Persian language, providing a comprehensive resource to scholars and academic researchers, as well as describing usage in its many variations throughout the world.