Theatre in Iran (), sometimes also translated as A Study on Iranian Theatre, is a research work by Bahram Beyzai on theater in the Persian world from the ancient times to the twentieth century, published in 1965. It has been described as "the definitive work on the history of Persian theatre."
The chapters of the book were published as articles in advance, i.e. 1962 and 1963. In 1965 the writer published them as namayesh dar Iran (literally meaning "Theatre in Iran") with the English title of A Study on Iranian Theatre on the back cover. The book became and stayed to be the major contribution in the field. Later, its publication was entrusted to Roshangaran Publishing, which came to be Beyzai's exclusive Persian publisher.