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Monika Diehl

Monika Diehl

Counsel

Counsel
Monika Diehl

Monika Diehl focuses on dispute resolution, including commercial and investment arbitration, and is a member of our International Arbitration Group.

She has many years of experience representing clients in complex litigation and international arbitration disputes spanning a variety of sectors, including oil & gas, renewables, infrastructure, real estate, TMT and finance. She has a notable track record in investment treaty arbitrations, with a particular focus on the CEE region. Her expertise is further enriched by the time spent on secondment with the Frankfurt international arbitration team. She also has extensive experience in cross-border regulatory and white-collar crime internal investigations, as well as compliance.

Contact details

Career & qualifications

  • University of Warsaw, Faculty of Law and Administration 2012
  • University of Warsaw, Faculty of Journalism and Political Sciences (International Relations) 2012
  • Joined Clifford Chance 2012
  • Admitted as an advocate (adwokat) in Poland 2016

Professional bodies

  • Member of the Warsaw Bar Association (ORA w Warszawie)
  • Member of the ICC Poland National Committee
  • Member of the ICC Commission on Arbitration and ADR
  • Member of the ICC Poland Compliance Commission

Awards and citations

  • "Monika Diehl is recognised for her experience assisting clients with BIT and ICSID arbitration proceedings. She is also well placed to advise on set aside proceedings. In addition to her role as counsel, she is also well known for her work as an arbitrator."
    Chambers Europe 2026 – Arbitration – Poland
  • "Monika Diehl has very broad international experience, I'd say she's a true international arbitration lawyer."
    Chambers Europe 2026 – Arbitration – Poland
  • "Monika Diehl’s support in arbitration is characterised by a blend of legal acumen, strategic insight and a dedicated client focus."
    Chambers Europe 2026 – Arbitration – Poland
  • "Monika Diehl handles complex cases with ease, works tirelessly and delivers great results."
    Chambers Europe 2026 – Arbitration – Poland
  • "Monika Diehl has a very quick reaction every time. She is really good at thinking outside the box, being proactive and choosing the right strategy, not going into dead ends unnecessarily."
    Chambers Europe 2026 – Arbitration – Poland
  • "Monika Diehl is an outstanding lawyer who consistently leads complex international cases with confidence and clarity. She is a strong lawyer, always ready with strategic, well thought-out arguments."
    Chambers Europe 2026 – Arbitration – Poland
  • "I would point out our work with Monika Diehl, who has demonstrated a fantastic sense for fruitful cooperation with us, a keen sense for the client’s needs and objectives and a thorough experience of related matters. It was a true pleasure to work with her."
    Legal 500 EMEA 2024: Dispute Resolution – Poland
  • Recognised as a 2025 Future Leader in Lexology Index Arbitration Future Leaders – Non-Partners ranking.
  • Recognised by Forbes Women as one of the top 25 women business lawyers in Poland in 2024.
  • Received an honourable mention in the "Female Attorney of the Year 2020" awards organized annually by the Polish Supreme Bar Council.
  • Nominated in the Rising Stars Lawyers Leaders of Tomorrow 2020 competition organized by Wolters Kluwer in Poland.

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