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Centre for Commercial Law Studies

Dr Maria Ioannidou, LLB, LLM (Athens), MJur, MPhil, DPhil (Oxon, Corpus Christi College)


Senior Lecturer in Competition Law

Telephone: 020 7882 2724
Room Number: Lincoln's Inn Fields


Maria Ioannidou is a Senior Lecturer in competition law at the School of Law, Queen Mary, University of London where she also serves as the Deputy Director of the Interdisciplinary Centre for Competition Law and Policy. Previously, she was a Lecturer in law at the University of Surrey, where she taught constitutional, contract and EU law. She has also practiced competition law in leading law firms in Athens, Greece and Brussels, Belgium. Maria studied law in Athens (BA, LLM) and Oxford (MJur, MPhil, DPhil), during which time she also worked as a researcher and conducted legal research in a wide range of EU and US competition law issues.

Her areas of interest include EU, UK and international competition law, competition law enforcement, the interaction between competition and consumer law, competition law in the energy sector, as well as the impact of big data and artificial intelligence on competition law enforcement and the consumers’ role in markets. Maria serves as the managing editor for the Journal of Antitrust Enforcement and as an editor of the World Competition Law and Economics Review. She is the author of ‘Consumer Involvement in Private Competition Law Enforcement’ (OUP 2015).

Since September 2019, she has joined the Hellenic Competition Commission as Board Member/Commissioner Rapporteur.

Undergraduate Teaching

LAW6048 Competition Law


Research Interests:

Maria’s current research addresses the changing role of consumers in the 4th industrial revolution. It focuses on the impact of AI, big data and digital platforms on consumer choice. The main research question is how fast technological developments impact our consumption behaviour, what are the promises, challenges and risks and how the legal framework should adjust, in particular competition and data protection law. Maria has been invited to give evidence to the UK All Party Parliamentary Group on AI and has submitted written evidence to House of Lords Select Committee on AI.



  • Y Chen, M Ioannidou and B  Xiong, Competition Law and Policy in Digital Markets: A Comparative Analysis in the EU and China (OUP, forth 2021)
  • M Ioannidou, Consumer Involvement in Private EU Competition Law Enforcement
    (OUP 2015).


  • M Ioannidou, "Responsive Remodelling of Competition Law Enforcement" (2020) Oxford Journal of Legal Studies (forth)
  • M Ioannidou and D Mantzari, "The UK Domestic Gas Electricity (Tariff Cap) Act: Re-regulating the Retail Energy Market" (2019) 82 Modern Law Review 488
  • M Ioannidou, "Compensatory Collective Redress for Low Value ConsumerClaims in the EU: A Reality Check" (2019) 6 European Review of Private Law 1367
  • M Ioannidou, “The Member State Reports on the Transposition of the Directive: Cyprus” in Barry Rodger, Miguel Sousa Ferro, and Francisco Marcos (eds), The EU Antitrust Damages Directive (OUP 2018) 82
  • M Ioannidou, “The Member State Reports on the Transposition of the Directive: Greece” in B Rodger, M Sousa Ferro, and F Marcos (eds), The EU Antitrust Damages Directive (OUP 2018) 158
  • M Ioannidou (with Ioannis Kokkoris), “Challenges in Competition Law and the Pharmaceutical Sector in BRICS Countries” in in P Figuerora and A Guerrero Perez (eds), EU Law of Competition and Trade in the Pharmaceutical Sector (Edward Elgar 2018) 687
  •  M Ioannidou, “The Application of Article 102 TFEU in the EU Energy Sector: a critical evaluation of commitments” in F Di Porto and R Podszun (eds), Abuse Regulation in Competition Law (Edward Elgar 2018) 129
  • M Ioannidou, “Effective Paths for Consumer Empowerment and Protection in Retail Energy Markets” (2018) J Consum Policy
  • M Ioannidou and J Nowag, ‘Can two wrongs make it right? Reconsidering minimum resale price maintenance in the light of Allianz Hungaria’ (2015) European Competition Journal 340
  • M Ioannidou (co-authored with A Ezrachi), The Internationalization of Competition Law and Policy: The Domestic Perspective (2014) 1 The Journal of International and Comparative Law 39
  • M Ioannidou (co-authored with A Ezrachi), ‘Buyer Power in European Union Merger Control’ (2014) 10 European Competition Journal 1
  • M Ioannidou (co-authored with V Brisimi), ‘Stand-alone damages actions: insights from Greece and Cyprus’ (2013) 34 European Competition Law Review 654
  • M Ioannidou (co-authored with A Ezrachi), ‘Public Compensation as a Complementary Mechanism to Damages Actions: from policy justifications to formal implementation’ (2012) 6 Journal of European Competition Law and Practice 536
  • M Ioannidou, ‘Reforming UK Competition Law Regime: The Consumer Perspective’ (2012) 11 Competition Law Journal 28
  • M Ioannidou, ‘Enhancing Consumers’ Role in EU Private Competition Law Enforcement: a Normative and Practical Approach ’ (2012) 8 Competition Law Review 59
  • M Ioannidou (co-authored with A Ezrachi), ‘Access to Justice in European Competition Law – Public Enforcement as a Supplementary Channel for “Corrective Compensation’ (2011) 19 (2) Asia Pacific Law Review 1
  • M Ioannidou (co-authored with V Brisimi), ‘Criminalising Cartels in Greece: a Tale of Hasty Developments and Shaky Grounds’ (2011) 34 World Competition 157.


Dr Ioannidou welcomes proposals for postgraduate supervision in the fields of EU competition law, international competition law and EU consumer law.

Dr Ioannidou is currently supervising:

  • Aleksandar Ivanovski, “Interaction of EU State Aid Law and Tax” (with Christiana HJI Panayi)
  • Anja Sophie Margot Naumann, “Establishing an obligation for the EU commission's DG COMP to take health objectives into account, based on the mainstreaming provisions and the 'Health in all’ policies rationale in EU law” (with Eyad Dabbah)
  • Claudia O’Kane, “The benefits and drawbacks of specialised competition courts in developing countries” (with Eyad Dabbah)
  • Yajie Gao, “The role played by industrial policy in the antitrust legislation and enforcement – a comparison between the PRC and EU systems” (with Ioannis Kokkoris).

Public Engagement

  • Deputy Director of the Interdisciplinary Centre for Competition Law and Policy
  • Member of the Centre for Law and Society in a Global Context (CLSGC)
  • Managing editor: Journal of Antitrust Enforcement (OUP)
  • Project co-ordinator: Journal of Antitrust Enforcement Agency Effectiveness Study
  • Member of the Centre for Competition Law and Policy, University of Oxford.

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