About O'Brien & Co.

O'Brien & Co. is a well-established firm of Certified Public Accountants and Registered Auditors based in Blackrock, County Dublin. Founded by Tom O'Brien, we have been serving businesses and individuals across Ireland since 2002.

Our practice is built on the core principles of professional integrity, personal service, and technical excellence. We believe that every client deserves a tailored approach — no two businesses are the same, and neither should their financial strategies be.

Over the years, we have grown alongside our clients, many of whom have been with us since we first opened our doors. Our team combines deep technical knowledge with practical business experience, enabling us to provide advice that is not only technically sound but commercially relevant.

As a firm, we are committed to:

• Building lasting relationships — we take the time to understand your business, your goals, and your challenges.
• Delivering proactive advice — we don't just report on the past, we help you plan for the future.
• Maintaining the highest standards — as Registered Auditors, we adhere to strict professional and regulatory standards.
• Embracing technology — we use modern accounting systems to provide efficient, accurate, and timely services.

Whether you are a start-up looking for guidance, an established business seeking strategic advice, or an individual needing tax planning, we are here to help.