Ms Rosaleen Byrne > McCann FitzGerald LLP > Dublin, Ireland > Lawyer Profile

McCann FitzGerald LLP

Work Department

Commercial Disputes, Administrative & Public Law, Competition, Regulated Markets & EU Law, Intellectual Property, Banking & Financial Services Disputes


Rosaleen is a partner in the firm’s Disputes Group. Rosaleen has almost 20 years’ experience of handling complex and large scale commercial disputes in a number of sectors including financial services, telecommunications, pharmaceutical, aviation and pensions. Rosaleen’s practice has a particular focus on cases with a regulatory or economic aspect and encompasses investigations and enforcement actions. Rosaleen also advises clients on all types of intellectual property matters with a focus in recent years on patent litigation.


Qualified in 1997


Graduate of University College Dublin BCL – 1993, LLM, University College Dublin 1994, (Commercial Law), Postgraduate Dipoma in EC Competition Law – Kings College London 2002

Lawyer Rankings

Ireland > EU and competition

McCann FitzGerald LLP is another Dublin firm with an estimable record in merger control, obtaining CCPC clearance in a number of complex engagements, including those in the banking and insurance sectors. Cartels and private enforcement are also fortes for the firm, along with competition litigation where it notably represented DAF Trucks in the headline follow-on damages claim resulting from a European Commission competition infringement decision. Philip Andrews has immense experience and leads the team, which includes Laura Treacy, an experienced figure in state aid, merger control and cartels. The litigation expertise of Rosaleen Byrne and Catherine Derrig provide the team with additional heft in state aid disputes and follow-on damages claims.

Ireland > Telecoms

(Leading individuals)

Rosaleen ByrneMcCann FitzGerald LLP

McCann FitzGerald LLP is highly active in the telecoms sector, with experience handling both contentious and non-contentious matters. The practice has a particular specialism in advising on the competition elements of transactions such as acquisitions and joint ventures. In the disputes space, Rosaleen Byrne is frequently instructed on matters involving ComReg, acting for the regulator in litigation as well as providing advice to clients facing investigations into alleged non-compliance with regulations. Byrne co-heads the practice alongside regulatory specialist Philip Andrews and corporate partner David Lydon. Laura Treacy returned to the Dublin office from Brussels in 2020 and is another name to note, with a focus on competition law.

Ireland > Public sector

McCann FitzGerald LLP leverages its expertise across a range of areas of law to provide a comprehensive service to public sector clients. The team is highly active in advising on the procurement of services and projects, ensuring that clients comply with competition and state aid regulations. The practice is also frequently engaged by regulators to advise on investigations and enforcement, as well as judicial review proceedings. Eamonn O’Hanrahan is a key name in the public transport space, particularly in project finance and development. Michelle Doyle is also engaged in projects-related work, with a specialism in assisting clients with avoiding judicial reviews of their decisions, while Rosaleen Byrne and Catherine Derrig focus on contentious matters. Consultant Seán Barton advises a number of public bodies on their functions and the exercise of their powers.

Ireland > Dispute resolution

(Leading individuals)

Rosaleen ByrneMcCann FitzGerald LLP

McCann FitzGerald LLP has a long history of engagements in major litigation, arbitration, regulatory and white-collar crime investigations and other contentious proceedings. It continues to be recognised for its strength in insurance and financial services cases, contractual disputes, product liability matters and public law cases. The sizeable team has a wide variety of engagements spread across the individual partners and other team members. Helen Kilroy is a leading figure in commercial litigation and mediation, including shareholder disputes and breach of warranty claims. Rosaleen Byrne is another with outstanding experience in big-ticket disputes. Former partner Sean Barton  has moved into a consultancy role with the firm.