Killian O’Reilly | Fieldfisher
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Professional background

Professional background

I specialise in the resolution of commercial disputes and have significant experience in commercial litigation, arbitration, construction disputes, insurance disputes and property related cases.

I advise clients on a wide variety of contractual claims, shareholder disputes, specific performance litigation, judicial reviews, professional indemnity claims, planning and environmental law, injunctions, and procurement law issues.

I represent most domestic and numerous international underwriters and re-insurers. I advise some of Ireland’s most successful organisations and regularly conduct High Court and Commercial Court litigation on their behalf.

I also represent employers at the Workplace Relations Commission and The Labour Court in respect of employment related disputes.

I advise clients on health and safety risks, defend organisations & executives in respect of Health and Safety Authority inspections and prosecutions, and represent clients in respect of coroner inquests and any related civil proceedings. 

I have specialist experience advising clients on cyber-crime and legal issues relating to cyber protection measures, and have also provided training in this area.In addition, I regularly advise clients in relation to technology disputes. 

I aim to provide advice that is clear and concise, communicating technical concepts in a way that is easily accessible for clients.

I am a CEDR accredited mediator who regularly represents clients in mediation and also acts as a mediator.

I regularly present lectures, training and workshops, for the Insurance Institute of Ireland and its members in relation to litigation and insurance matters.

Awards & recognition

Awards & recognition

Chambers Europe 2024

"Killian has an excellent understanding of his client's needs and develops appropriate strategies."

Chambers Europe 2023
He has a great commercial sense and offers very clear advice. He is an excellent adviser.
Killian O'Reilly - Legal 500 EMEA 2023
Killian O’Reilly is a top class lawyer
 

Authored pieces

All Resources
A small plant with a single green leaf emerges from a stack of coins, symbolizing financial growth. To the right, water pours from a red watering can, illustrating the nurturing of investments. The background is a blurred mix of green and blue hues.
Litigation and Dispute Resolution
Insight

QPQ Limited v Schute: High Court Compels Disclosure of Litigation Funding Arrangements

14.08.2026
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A wooden gavel rests on a sound block in the foreground, with a balanced scale of justice in the background. The setting appears to be a courtroom or a law library, indicated by the blurred shelves filled with books.
Litigation and Dispute Resolution
Insight

The Defamation (Amendment) Act 2026: Key Changes from 1st March

13.03.2026
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Four men in business suits stand side by side, smiling, in front of a modern wooden wall. Three men wear dark suits with purple ties, and one wears a blue suit with a pink tie.
Litigation and Dispute Resolution
Press Release

International Law Firm Fieldfisher Expands Dispute Resolution Offering with Appointment of Leading Dublin Partner Dermot McEvoy

16.09.2025
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Two individuals sitting at a wooden table, with one holding a pen poised to write on a blank sheet of paper. Their hands are close together, suggesting collaboration or discussion. The focus is on their hands and the pen, with a blurred background.
Litigation and Dispute Resolution
Insight

First of its kind Collective redress action in Ireland

29.05.2025
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Litigation and Dispute Resolution
Insight

Adjudication Undone: Lessons from Tenderbids Limited v Electrical Waste Management

04.04.2025
The Irish High Court case of Tenderbids Limited v Electrical Waste Management1  offers valuable insights into the importance of adhering to contractual terms and statutory requirements in construction disputes. This case serves as a reminder that procedural missteps can undermine the entire adjudication process, even in cases where the dispute itself is valid.
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What others say…

Chambers Europe 2024

"Killian has an excellent understanding of his client's needs and develops appropriate strategies."

Chambers Europe 2023
He has a great commercial sense and offers very clear advice. He is an excellent adviser.
Killian O'Reilly - Legal 500 EMEA 2023
Killian O’Reilly is a top class lawyer