Mullets are banned in Iran.

In 2010, Iran's culture ministry produced a list of haircuts that meet government approval. Making the banned list are ponytails, mullets, and elaborate spikes. Goatees, previously frowned upon, are also now allowed.

The reasoning behind this is an attempt to rid the country of “decadent Western cuts.” Approved haircuts are “inspired by Iranians' complexion, culture and religion, and Islamic law.”

Iranian police often carry out “morality checks,” arresting men and women who are wearing unaccepted styles, in order to support the Iranian and Islamic culture and keep western influences out.

(Source)