Are referendum results binding?

Iran, Islamic Republic of
- Mandatory referendum - always
- Optional referendum - always
Constitutionof the Islamic Republic of Iran
(Adoptedin 3 December 1979, 28 July 1989)
http://www.alaviandassociates.com/documents/constitution.pdf
Article123.
The President is obliged tosign legislation approved by the Assembly or the result of a referendum, afterthe (related) legal procedures have been completed and it has been communicatedto him. After signing, he must forward it to the responsible authorities forimplementation.