It was attended by experts from Iran the P4+1 group (Russia, China, France, the UK and Germany).
Bilateral and multilateral meetings will also continue today at the level of the heads of delegations, according to the Iranian Ministry of Foreign Affairs.
Over the past two days, intensive talks have been held at different levels and formats.
The new round of talks between Iran and P4+1 – Russia, China, the UK, France and Germany - on the revival of the 2015 nuclear deal - known as the Joint Comprehensive Plan of Action (JCPOA) - and the termination of sanctions on Tehran restarted in Vienna on Monday.
The JCPOA negotiations resumed after the parties took a three-day break for the New Year.
Representatives of Iran and the P4+1 group began the eighth round of the Vienna talks on December 27 focused on the removal of all sanctions imposed on Tehran after Washington’s unilateral withdrawal from the agreement. The US is not allowed to directly attend the talks due to its pullout in 2018 from the landmark deal with Iran.