File photo: European Union foreign policy chief Josep Borrell speaks during a press conference at the EU Delegation on Sept. 20, 2021, in New York City.
The fourth round of sanctions against Tehran over its repression of demonstrators was adopted by the bloc's foreign ministers meeting in Brussels.
The full list of names was to be given in the EU's official journal later on Monday.
The bloc has already imposed sanctions on more than 60 Iranian officials and entities over the crackdown on protestors, including targeting Tehran's "morality police", Revolutionary Guard Corps commanders and state media.
But the 27-nation EU has so far stopped short of blacklisting the Revolutionary Guards themselves as a terror group despite calls from Germany and the Netherlands to do so.
Iran has warned the bloc against taking the move and EU officials are wary that it could kill off stalled attempts to revive the 2015 deal on Tehran's nuclear programme being mediated by Brussels.
EU foreign policy chief Josep Borrell insisted that there needed first to be a legal ruling in an EU member state first before the bloc could make the move.
"You cannot say: 'I consider you a terrorist because I do not like you'," Borrell said.
"It has to be done when a court of one member state issues a legal statement, a concrete condemnation."
Demonstrations have swept Iran since the September 16 death in custody of Iranian Kurdish woman Mahsa Amini, 22, after her arrest in Tehran for allegedly failing to adhere to the Islamic republic's strict dress rules.
Iran has arrested at least 14,000 people in the wave of protests, according to the United Nations.
Iranian authorities have executed four people for their role in the unrest and imposed the death penalty on a total of 18, triggering widespread international outrage.
The foreign ministers of France and Belgium urged the bloc to confront issue of Iran's detention of EU citizens, seen as "hostage-taking" by rights groups and families of those detained.
"I think it is time that we Europeans think about how to respond to this policy of state hostage-taking that Iran is now practising," French minister Catherine Colonna said.
"This must be taken into account in our thinking and in the decisions we will have to take in the future."
Brussels is pushing for the release of Belgian aid worker Olivier Vandecasteele, who has been sentenced to over 12 years in jail on "espionage" charges decried by UN experts.
France said last week that it is "extremely worried" about the health of a French-Irish citizen Bernard Phelan held in Iran since since October.
Around two dozen foreigners and dual nationals are detained in Iran.
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