This paper investigates the intonational properties of different types of interrogatives in Persian in the framework of the autosegmental-metrical theory of intonation. The structures studied are different types of yes/no questions, WH-questions, tag questions, and echo questions. The results, which are based on a total of nearly 400 read utterances recorded in laboratory conditions, show that the Persian Accentual Phrase (AP) with the pitch accent (L+)H* is present in all question types. Yes/no questions, whose accentuation follows the same constraints as declaratives, are characterized by a high Intonational Phrase boundary tone (H%), and have a greater pitch excursion and more final lengthening on the last AP than declaratives. The inclusion of particles and words such as aya, m?ge, and hič in the question adds an AP but does not change the core intonation pattern. In (multiple) WH-questions, which have a falling intonation similar to declaratives, the (final) WH-word is the nuclear pitch accent, followed by the deaccentuation of the upcoming elements. Echo questions end high and the boundary tone of their final AP can be either high or low. Contrastive focus APs are higher and longer than ordinary APs and deaccent what follows, even if it includes a WH-word.