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Tiago Duarte
Bio
Senior Counsel

Tiago Duarte

Joined PLMJ in 2004.
Senior counsel in the Public Law practice.

About Tiago

Tiago is a senior counsel in the Public Law practice and has more than 25 years' experience in public law and arbitration. He combines legal practice, arbitration and academic work.

As a lawyer, he specialises in administrative law, with particular expertise in major public-private partnership projects, especially during the public procurement stage, the implementation of contracts, and administrative litigation and arbitration, both domestic and international. He also has extensive experience across all phases of administrative procedure and has advised private companies and public bodies on a range of matters, including proceedings before the Court of Auditors and the Constitutional Court.

As an arbitrator, he has acted in domestic and international disputes, including as sole arbitrator in an ICC arbitration. He is also one of the four Portuguese arbitrators nominated by the Portuguese State to the ICSID Panel of Arbitrators. Before this appointment, he had already acted as a lawyer and legal expert in several ICSID arbitrations.

As an academic, Tiago holds a doctorate in public law from NOVA School of Law and is a professor at Católica Lisbon School of Law, where he teaches constitutional law, administrative contracts and international investment arbitration. He is also a guest lecturer at other universities and regularly teaches on postgraduate programmes.

He has published extensively on constitutional law, administrative law, public finance and international investment arbitration. He was also a visiting fellow at the Lauterpacht Centre for International Law and Wolfson College, University of Cambridge.

Practices:
Administrative and constitutional litigation
Financial public law and the Court of Auditors
PPPs, concessions, infrastructures and projects
Public procurement and administrative contracts
Sectors:
Government and public sector
Manufacturing
Desks:
Italian Desk

Contacts

Office: Lisbon
(+351) 213 197 300*
tiago.duarte@plmj.pt

*National landlines call

Languages:
English, Spanish, French, Italian

Academic Background

  • Law degree from the Faculty of Law of the University of Lisbon, 1995
  • Admitted to the Portuguese Bar Association, 1997
  • Doctoral and master's studies at NOVA School of Law, 1997-1999
  • Doctorate in public law from NOVA School of Law, 2005
  • Lecturer in economic law and tax law at the Faculty of Law of the University of Lisbon, 1994-1999
  • Professor and course leader in financial law (public finance) at NOVA School of Law, 2004-2007
  • Professor and head of administrative law and constitutional law at NOVA School of Law, 2006-2018
  • Professor on the Master's in Law and Management at NOVA School of Business & Economics, 2010-2018
  • Visiting fellow at the Lauterpacht Centre for International Law and Wolfson College, University of Cambridge, 2011-2012
  • Professor and head of public contracts law at NOVA School of Law, 2012-2018
  • Professor of public law arbitration and investment arbitration on the postgraduate programme in arbitration at NOVA School of Law, 2012-2018
  • Professor of investment arbitration on the LL.M. in European and Transglobal Business Law at the University of Minho, since 2013
  • Professor at Católica Lisbon School of Law, since 2018

Professional Background

  • Senior counsel since 2023
  • Partner at PLMJ, 2008-2023
  • Legal adviser to the Secretary of State for the Presidency of the Council of Ministers, 1995-1997
  • Legal assistant to the Secretary of State of the Portuguese Communities - Ministry of Foreign Affairs, 1997-1999
  • Consultant at the Office of Legislative Policy and Planning of the Ministry of Justice, 2001-2004
  • Legal assistant and head of the cabinet of the Deputy Secretary of State of the Minister of Economy, 2002- 2003
  • Arbitrator in various arbitrations since 2009
  • Member of the panel of arbitrators at the Commercial Arbitration Centre (CCIP) and at the Administrative Arbitration Centre (CAAD) since 2012
  • President of Investment Arbitration Board of the Portuguese Arbitration Association (APA) since 2013
  • President of the Monitoring Committee of the New Urban Lease Law, 2013
  • Legal expert in international arbitration at the ICSID
  • Permanent member of the National Ethics Council for Life Sciences

Member of

  • Member of the National Council of Ethics for the Life Sciences (Conselho Nacional de Ética para as Ciências da Vida), elected by the Portuguese Parliament

The Legal 500

2026 - Tiago Duarte, Recommended | Public Law
2025 - Tiago Duarte, Recommended | Public Law
2023 - Tiago Duarte, Recommended | Public Law
2022 - Tiago Duarte | Public Law
2021 - Tiago Duarte | Public Law
2020 - Tiago Duarte | Public Law
2019 - Tiago Duarte | Public Law
2018 - Tiago Duarte | Public Law
2017 - Tiago Duarte | Public Law

Chambers Europe

2026 - Tiago Duarte, Band 2 | Public & Administrative Law

"Tiago Duarte maintains a highly relevant presence in the Portuguese public law market. He brings a unique experience that combines advocacy with academia and arbitration at the highest level."

2025 - Tiago Duarte, Band 2 | Public & Administrative Law
2024 - Tiago Duarte, Band 2 | Public & Administrative Law
2023 - Tiago Duarte, Band 2 | Public & Administrative Law
2022 - Tiago Duarte, Band 2 | Public & Administrative Law
2021 - Tiago Duarte, Band 2 | Public & Administrative Law
2020 - Tiago Duarte, Band 2 | Public & Administrative Law
2019 - Tiago Duarte, Band 2 | Public & Administrative Law
2018 - Tiago Duarte, Band 2 | Public & Administrative Law
2017 - Tiago Duarte, Band 2 | Public & Administrative Law
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