Kildare firm Coonan Cawley is to merge with Co Wicklow firm Kevin M. Houlihan & Co Solicitors in August.
Kevin Houlihan founded his own practice in 1981 and will consult for the new entity.
Coonan Cawley managing partner Susanna Cawley said "We believe this merger will ensure business continuity for Kevin’s valued clients and we look forward to providing the highest calibre of legal advice to these clients in an environment where quality of service, efficiency and responsiveness are of paramount importance.
"We believe this merger will bolster our existing expertise and network of connections and provide synergies of business which will be of benefit to both our new and existing clients."