The Iran Human Rights Documentation Center (IHRDC) released a comprehensive English translation of books one, two and five of the Iranian Penal Code.
Books one and two cover subjects such as: the trial and punishment for sex crimes like adultery and sodomy, the trial and punishment for consumption of alcohol and other intoxicating substances, and the trial and punishment for theft. The link to the translations on the IHRDC website can be found here.
Book five deals with crimes such as: theft, fraud, forgery, insult, crimes against national security, crimes against property, and crimes against people. The link to the translation on the IHRDC website can be found here.