The “impressive Killian O’Reilly is a seasoned, reliable lawyer. He has the underlying technical knowledge and experience, and is also well organised and keeps things moving at an efficient pace”.


Killian O’Reilly


Killian is a highly experienced litigator with over 20 years’ experience in representing clients at all court levels, including the Commercial Court, Court of Appeal and Supreme Court across the commercial, insurance, and public sectors. He regularly advises clients on breach of contract issues, shareholder disputes, construction losses, specific performance litigation, professional indemnity claims and procurement law issues.

Killian also has specialist experience advising clients on cyber-crime and legal issues relating to cyber protection measures, and provides training in this area.

Killian is a CEDR accredited mediator who regularly represents clients in mediation and also acts as a mediator. He also regularly presents lectures, training and workshops, for the Insurance Institute of Ireland in relation to litigation and insurance matters.


Killian’s experience includes:

  • Advising and representing Ryanair on litigation and employment issues since 2005.
  • Advising and representing Lidl Ireland GMBH on litigation and employment issues since 2005.
  • Advising and representing Insomnia since 2009.
  • Regularly advising insurers and self-insured commercial organisations with regard to litigation and employment matters.
  • Regularly advices Domestic and London based insurers in all manner of insurance disputes.
  • Providing advice on insurance coverage and pre-litigation exposures.
  • Representing clients in procurement, corporate fraud, professional negligence, insurance and litigation.
  • Advising clients with regard to litigation arising out of wills and probate.
  • Legal 500 EMEA 2019

    Dispute Resolution: Killian O’Reilly heads the team, which is particularly active in financial services and insolvency litigation, as well as acting for several clients in relation to highly sensitive cyber breaches.

    Insurance: The Firm provides ‘very commercially focused insurance defence work’. ‘Standout’ practice head Killian O’Reilly is ‘excellent’; he is ‘knowledgeable and competent and his advice is very clear and helpful’.

  • Chambers Europe 2019
    Killian O’Reilly draws on a strong base of experience to assist clients with a diverse range of commercial disputes. One interviewee describes him as “clear, concise and very commercially driven.”

    Killian O’Reilly of McDowell Purcell Solicitors (now Fieldfisher Ireland) has a breadth of experience assisting domestic and international insurers with personal injury and professional negligence claims.

  • Chambers Europe 2018
    The “impressive” Killian O’Reilly, “a seasoned, reliable lawyer.” He “has the underlying technical knowledge and experience, and is also well organised and keeps things moving at an efficient pace.”

  • Legal 500 EMEA 2018
    Killian O’Reilly is “very experienced” and has “an in-depth knowledge of litigation procedures”.

  • Chambers Europe 2017
    Killian O’Reilly is described by clients as “very knowledgeable, coming across as someone at the top of his game.” He heads the department’s commercial disputes team with a particular focus on contentious insurance matters. He recently acted for Ryanair on litigious labour law matters which also involved cross-border considerations.

  • Legal 500 EMEA 2017
    At McDowell Purcell (now Fieldfisher Ireland), practice head Killian O’Reilly is ‘highly experienced in dealing with the cut and thrust of personal injury litigation’.

  • Admitted as a solicitor In Ireland, 1995
  • Admitted to the Roll of Solicitors in Northern Ireland
  • Diploma in Employment Law
  • CEDR Accredited Mediator
  • LL.M. European Law
  • BCL
  • Law Society of Ireland
  • The Dublin Solicitors Bar Association (Chair of the Litigation committee)
  • Commercial Litigation Association of Ireland
  • Irish Commercial Mediators Association (Council member)
  • Employment Lawyers Association of Ireland
  • Professional Negligence Lawyers Association
  • British Insurance Law Association

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