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Deirdre Ardagh

Deirdre Ardagh

Position: Partner
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Phone: +353 1 5546243


Deirdre Ardagh is a Partner in our Corporate, Regulatory & Compliance Departments.

Deirdre is a Solicitor, former Barrister, and a CEDR accredited mediator with over 10 years PQE. In addition to her career in law, Deirdre has also worked as both an economist and public policy professional across Government agencies including IDA Ireland, Forfas, and the National Competitiveness Council.

Deirdre has a strong background in Regulatory and Administrative Law having worked with many technology, media and telecom companies dealing with their regulatory interaction from consultation to Commercial Court and Supreme Court litigation. Deirdre has advised clients on Mergers and Acquisitions, Corporate Reorganisations and Restructuring, as well as Corporate Advisory matters to include Private Equity and Venture Capital. Deirdre also advises on Receivership and Liquidation.

Deirdre has worked on many complex commercial contracts, and she actively engages in helping clients design their agreements and strategic positions. She has experience with Terms of Service, IT supply agreements and Terms and Conditions, particularly for clients in the SaaS, IT Services, data and technology sectors. Her work often involves advising businesses how to design and conclude contracts, including distribution, supply, services and sales agency arrangements. Deirdre advises Sherwin O’Riordan clients on all aspects of privacy and data protection laws including Data Processing Agreements, Privacy Impact Assessments, policies, audits and GDPR. She frequently supports clients helping them deal with the application of data protection laws to their businesses and relationships. Deirdre has helped clients where cyber security challenges have emerged and where data breach issues are at stake with her advice and services.


  • Law Society of Ireland
  • CEDR Accredited Mediator


“Where others flapped and embellished, Deirdre cut through the noise, understood our needs and delivered the results we required. Having worked with may corporate law firms over the years their ability to waste time and resource on long winded, jumped up documentation still leaves me flabbergasted, thankfully not the case with Deirdre. Could not recommend highly enough for Data Protection and Commercial Contract support/advice.”

Bill Ingram, Managing Partner at SourceChain Marketplace

“Deirdre is a superbly able and effective strategy and policy professional. She has the rare combination of not only the ability to understand and distill complex issues but also the skills to communicate with a variety of people across organisations and at different levels. Deirdre has a tremendous depth of knowledge and experience of Irish regulatory, technology and legal fields. I would have no hesitation in recommending Deirdre.”

Carol Boate, National Lottery Regulator


"In their work with Focus Ireland, Sherwin O’Riordan and Deirdre in particular have shown a deep knowledge and experience of the charity sector and an appreciation of the mission and vision of our work. This covered bespoke, specialist legal services, including advice on charity law, fundraising law, contract law and specific regulatory matters of relevance to Focus Ireland. Our needs were prioritised and handled with expertise and discretion. Deirdre and the team at Sherwin O’Riordan demonstrated an appreciation of the environment faced by charities and not-for-profit bodies in carrying out their activities within today’s commercial world, while adhering to best practice with regards to modern governance practices, regulatory regimes and charity law. I look forward in the future to working with Sherwin O’Riordan and Deirdre again as a trusted partner"

Pat Dennigan, Chief Executive Officer, Focus Ireland


"Deirdre is wonderful to work with. At all times I found her professional, practical and extremely helpful and responsive. She consistently demonstrated a clear understanding of our goals and delivered on time, every time. She has a fantastic work ethic, which she demonstrated while working on our corporate transaction over the last number of weeks culminating in the signing process which was organised extremely well and went off without a hitch. It is my first time dealing with Deirdre and I have been left very impressed."

Mark Doyle, Director at OMT Global, Leadership Development



"We simply cannot fault the service we receive from SOR. They have specialist solicitors in each area where we need advice and we’ve had contact with 4 different partners during the last 14 months, and the experience has been the same each time. Really really good."

Justin Cahill, Chairman, CMC Platform Financials

Office location

74 Pembroke Road
Dublin 4

Phone +353 1 663 2000
Fax +353 1 663 2001


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