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Maria Athanassiadou

Maria Athanassiadou

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Dr. Helen G. Papaconstantinou and Partners

Dr. Helen G. Papaconstantinou and Partners

Greece

1

Intellectual property

With a strong focus on pharmaceutical clients, Dr. Helen G. Papaconstantinou and Partners is well placed to handle patent litigation, infringement, and pre‑litigation matters. The team has notable experience before the Greek Patent Office, the Athens Single‑Member Court of First Instance, and the Council of State. Recognised for being ‘particularly skilled at navigating cross‑border and EU‑level procedures’ and praised for its ’deep legal expertise with a modern, client‑focused mindset’, the practice is co‑headed by Eva Yazitzoglou, who handles patent and trademark infringement cases, and Miranda Theodoridou, who focuses on trademark and IP litigation. Maria Athanassiadou brings extensive expertise in patent prosecution, infringement, and opposition proceedings.
Legal 500 Editorial commentary
Phone
0030 210 3626624
Email
[email protected]
Profile
hplawfirm.com

Profile

Work Department
Patents and Industrial Designs Department
Position

Senior Partner

Career

Maria Athanassiadou is an Attorney at Law and a founding partner of Dr. Helen G. Papaconstantinou and Partners, Law Firm (HP&P-2015). With nearly three decades of expertise across all realms of intellectual property, she spearheads the Patents and Industrial Designs Department of the firm. Maria's practice revolves around IP litigation, prosecution, and counseling, with a specialized focus on patents, utility models, supplementary protection certificates, industrial designs, and trademarks. She excels in drafting and reviewing IP contracts and providing pertinent consultancy services.

Maria's clientele comprises major international entities and local clients, particularly in the pharmaceutical sector. She adeptly assists them in devising and executing strategies tailored to their business objectives and needs.

Holding a law degree from the University of Athens, Greece, and a master's in Spanish studies from the University of Barcelona, Spain, Maria boasts a comprehensive educational background. Since 1996, she has been a member of the Athens Bar Association and is licensed to practice before the Supreme Court and the Council of State.

Most recent awards/recognitions include:

    • Leading Individual by Legal 500 EMEA 2021 - 2026 - Intellectual Property
    • Patent Litigation Lawyer of the Year in Greece - Corporate INTL – Global Awards 2026
    • Shortlisted as Practitioner of the Year for Greece by Managing IP Awards 2026 EMEA
    • Recommended Individual in IAM 1000 – World’s Leading Patent Professionals, 2020 - 2025
    • Trade mark star in Intellectual Property rankings in IP STARS 2021 - 2025

Maria is author of the Greek chapter of “European SPCs Unraveled (2nd edition, Wolters Kluwer) as well as a regular contributor to several significant patent, trademark and industrial designs publications, including Wolters Kluwer Manual IP, Lexology, IAM, World Trademark Review, Katzarov’s Manual on Industrial Property and several INTA resources. More authorship information at https://www.hpplawfirm.com/our_people/maria-athanassiadou/

Languages
Greek, English, Spanish, French, German
Memberships
Delegate of the International Federation of Intellectual Property  Attorneys (FICPI) Greek National Group Member of the Pharmaceutical Trademarks Group (PTMG) Member of International Trademark Association (INTA) Athens Bar Association, as from 1996
Education

Masters’ degree in Spanish studies, University of Barcelona, 2018

Law Degree, University of Athens, Greece, 1994

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Testimonials

Collated independently by Legal 500 research team.

  • ‘The team at Dr. Helen G. Papaconstantinou & Partners stands out as one of the most accomplished and specialised intellectual property practices in Greece. Their combination of deep academic knowledge and practical understanding of IP enforcement, prosecution, and litigation makes them a clear leader in the market. The group operates with exceptional coordination, ensuring that every case—whether involving trademarks, patents, or designs—is handled with precision and strategic foresight.'

    'What distinguishes them from other firms is their ability to combine a highly technical grasp of IP law with strong commercial awareness and client-oriented communication. They are particularly skilled at navigating cross-border and EU-level procedures, offering seamless support to international clients.'

    ‘Dr. Helen G. Papaconstantinou and Partners is our go-to firm for Greek patent work including high-value cases including SPCs. The team is professional and responsive.’

    ‘Maria Athanassiadou has impressed me in every case we have worked on together. She is always first to respond when sending out instructions across Europe.’

    ‘The IP team at Dr. Helen G. Papaconstantinou and Partners combines deep legal expertise with a modern, client-focused mindset. The firm stands out for its comprehensive handling of trademarks, patents, and designs, its strong litigation record, and its ability to manage complex, cross-border IP portfolios. Clients value the team’s responsiveness, strategic thinking, and precision. What truly differentiates the practice is its blend of legal excellence, technological awareness, and collaborative culture.’

    ‘They combine exceptional technical expertise with genuine commitment and integrity. What makes the team different from competitors is its blend of academic depth and real-world efficiency, and a culture of collaboration, trust, and professionalism. I have especially valued their clarity, reliability, and ability to deliver consistently excellent results under demanding circumstances.’