Duignan Carthy O’Neill has been established for over 50 years and has many years of experience helping businesses and individuals to grow and flourish in Ireland. It is our policy to support our clients through their entire life cycle - from the initial establishment to growth and expansion in Ireland and overseas - ensuring they are not only compliant with laws and regulations, but also primed for growth and investment.


Our Partner-led team has decades of experience in compliance and consulting services and our professional knowledge spans across all industries, from manufacturing, distribution and agribusiness to financial services and IT.


We have assisted dozens of Irish and international companies with their expansion plans, both in Ireland and abroad.


At home, we have helped multiple American, Asian and European multinationals to set up and run Irish operations. We also act as special advisers to American and European firms making acquisitions in Ireland and Europe.


Abroad, we have supported Irish companies in expanding into overseas territories or purchasing foreign companies.  

Duignan Carthy O’Neill is registered with the US based Public Company Accounting Oversight Board (PCAOB) which enables the firm to undertake the audit of USA Public Company Subsidiaries located in Ireland and the UK


Authorised by the Institute of Chartered Accountants in Ireland to carry on Audits and Business Activities.

Member of AGN International Ltd an association of independent accounting and financial advisory businesses.

© 2015 DUIGNAN CARTHY O'NEILL. Chartered Accountants, Registered Auditors, Dublin, Ireland. All Rights Reserved.