Zef Mazi (born 27 January 1956) is an Albanian diplomat, ambassador, who has served as Albania's Chief Negotiator with the European Union during 2020-2022.

[1][2][3] He previously served as Special Assistant to the Director General for Strategy at the International Atomic Energy Agency (IAEA) from 2011 to 2018, where he has been in charge for Agency-wide strategy formulation, planning and implementation, as well as risk-management and knowledge management.

He graduated from the Faculty of History and Philology, University of Tirana, for English and Albanian language and letters in 1977, and further studied international law.

[7][8][9] Mazi also served in the Multilateral Department at the MFA in Tirana and was a member of the Albanian permanent delegation to the negotiations on the resumption of diplomatic relations between Albania and the United Kingdom (1989–1991).

He has also contributed numerous articles on political issues about Albania and the Balkans in the Albanian and international media as well as in that of Kosovo.