According to ISNA, The inking ceremony was held in the presence of Iran's First Vice-President Eshaq Jahangiri and visiting Bulgarian Prime Minister Boyko Borissov.
Technology and communications, joint investment and industry have been the fields of the agreements.
Borissov, heading a high-ranking economic delegation, arrived in Tehran late on Sunday.
On Monday morning, he was welcomed by Jahangiri in the cultural and historical complex of Saadabad in north of Tehran.
EghtesadOnline: Iranian and Bulgarian officials inked three agreements on cooperation on Monday in Tehran.