42 leading accounting firms in Ireland (2026 list)

These are large professional services firms in Ireland, mostly focused on accounting, audit, and tax services. They include major international networks such as KPMG Ireland, a provider of audit, tax, and advisory services, and PwC Ireland, which offers assurance, advisory, and tax services. Grant Thornton Ireland provides innovative financial and business solutions, while S&W Ireland supports businesses with tax, accountancy, and advisory services. Deloitte Ireland delivers solutions for complex business challenges. My Office, based in Ennis, provides affordable bookkeeping and administration services.

The data shows a strong concentration of these firms in Dublin, with most of the largest companies headquartered there. This indicates a central hub for professional services within Ireland. While the majority are large, well-established firms, there are also some younger companies like Xeinadin Ireland, founded in 2019, providing business and personal financial solutions.

#	Company	Industry	Headquarters	Employees	Founded
1	KPMG Ireland kpmg.ie A leading provider of audit, tax, and advisory services for domestic and international clients across all sectors, specializing in driving value and navigating change	Accounting	🇮🇪 Dublin	2,978	n/a
2	Grant Thornton Ireland grantthornton.ie Providing innovative financial and business solutions with local expertise and global reach, fostering client relationships and ethical practices.	Professional Services	🇮🇪 Dublin	2,514	n/a
3	PwC Ireland pwc.ie Global network providing assurance, advisory, and tax services with a commitment to quality and building trust in society.	Professional Services	🇮🇪 Dublin	2,502	n/a
4	S&W Ireland swgroup.com Providing expert tax, accountancy, assurance, and advisory services to support Irish and international businesses through growth, risks, and exits.	Professional Services	🇮🇪 Dublin	2,293	1958
5	Deloitte Ireland deloitte.com Global professional services network delivering solutions and insights to address complex business challenges, with leadership capabilities, experience, and collaboration with clients	Management Consulting	🇮🇪 Dublin 2	1,594	n/a
6	My Office myoffice.ie Providing affordable bookkeeping and administration services for businesses, helping them be more efficient and save time and money	Accounting	🇮🇪 Ennis	748	n/a
7	Forvis Mazars In Ireland forvismazars.com provides audit, tax, consulting, financial advisory, corporate finance, and outsourcing services to international corporates, SMEs, financial institutions, and public bodies	Accounting	🇮🇪	739	n/a
8	BDO Ireland bdo.ie BDO Ireland offers personalized services with a human touch, providing practical solutions with intelligence, empathy, and purpose through a global network	Accounting	🇮🇪 Dublin	527	1982
9	Xeinadin Ireland xeinadin.ie Leading professional firm in Ireland providing market leading business and personal financial solutions through a dedicated team focused on quality, excellence, and innovation	Accounting	🇮🇪 Dublin	298	2019
10	RSM Ireland rsmireland.ie A leading firm in audit, tax, and consulting services with over 200 staff and 3 offices in Ireland Recognized for excellence	Accounting	🇮🇪 Dublin	261	n/a
11	OSK osk.ie Professional business advisor offering audit, accounting, tax, payroll, and advisory services to owner-managed businesses, SMEs, multinational groups, government bodies, and contractors since 1985	Accounting	🇮🇪 Dublin	208	1985
12	Crowe Ireland crowe.com A leading Chartered Accountancy and Business Advisory practice in Ireland, providing audit, tax, wealth management, and advisory services to a wide range of clients	Accounting	🇮🇪 Dublin	196	1941
13	DM Financial dmfinancial.com An Ireland-based firm provides financial reporting and accounting services for alternative asset managers globally, with a focus on expansion and expertise	Financial Services	🇮🇪 Limerick	187	2007
14	FPM fpmaab.com Leading business advisers providing comprehensive financial support to local SMEs, private clients, and national/international businesses across Ireland, UK, and Scotland	Accounting	🇮🇪 Ireland	149	1991
15	PKF Brenson Lawlor pkfbrensonlawlor.ie A top accountancy and business practice specializing in various sectors, providing full range of services with international connections through JPA network	Accounting	🇮🇪 Dublin	114	1972
16	Baker Tilly Ireland bakertilly.ie A full-service accountancy and business advisory firm focused on the business owner's interests, providing end-of-year audits, tax advice, compliance, and personal financial protection	Accounting	🇮🇪 Ireland	78	1997
17	FRAME (formerly BKK)frame.international A financial advisory firm with over 40 years of experience providing expert advice and strategic support to businesses across various industries	Accounting	🇮🇪 Cork	73	1977
18	O'Neill Foley onf.ie A leading business advisory and chartered accountancy firm in the South East of Ireland, offering expert services to clients locally and internationally	Accounting	🇮🇪 Kilkenny	59	1958
19	BFCD bfcd.ie BFCD is a go-to accountancy and advisory firm in Dublin, offering tailored financial services to owner-operated businesses with a global reach	Accounting	🇮🇪 Dublin	55	1988
20	TaxAssist Accountants Ireland taxassist.ie TaxAssist Accountants offers expert accounting services to small businesses in Ireland through a network of local teams and cutting-edge technology	Accounting	🇮🇪 Dublin	52	2009
21	Cooney Carey cooneycarey.ie A leading advisory firm providing auditing, taxation, company secretarial, and business advisory services with over 25 years of experience	Accounting	🇮🇪 Sandyford	47	1983
Want more companies than this list? This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. Get more companies, free
22	KBG Accountants kbg.ie A professional firm outside of Dublin with experienced partners and staff providing practical, cost-effective advice tailored to clients' business needs	Accounting	🇮🇪 Cavan	44	1989
23	Walsh O'Brien Harnett wobh.ie A top 20 professional advisory firm in Dublin offering accounting, audit, tax, advisory, and corporate services to a diverse range of clients	Accounting	🇮🇪 Dublin	43	2016
24	Hill Vellacott hillvellacott.com Belfast-based accountancy firm specializing in accounting, auditing, corporate finance, transaction services, forensic accounting, taxation advice, and personalized services for businesses and professionals	Accounting	🇮🇪 Belfast	42	n/a
25	O'Connor Pyne & Co. Limited oconnorpyne.ie A dynamic firm of Chartered Accountants in Cork, providing specialized technical advice, business advisory services, and a range of financial solutions	Accounting	🇮🇪 Ballincollig	39	2003
26	Tynan Dillon Xeinadin Group tynandillon.ie Established in 1952, the firm offers professional advice in management accounts, taxation, audits, investment business, and insolvency through three offices in Ireland	Accounting	🇮🇪 Ballsbridge	33	n/a
27	DJH Ireland msdaccountants.com Professional accountants offering tailored insights and expertise across various sectors, focusing on individual client needs for businesses in Ireland and internationally	Accounting	🇮🇪 Dublin	30	1990
28	KSi Faulkner Orr Ireland ksifo.ie Expert advice from partner-led teams in financial reporting, company secretarial, tax, and payroll Specializing in SMEs, arts, charities, and not-for-profits, with international reach	Accounting	🇮🇪 Dublin	28	1983
29	LHM Casey McGrath lhmcaseymcgrath.ie A leading ACCA Practice in Ireland offering expert services in audit, business advisory, corporate finance, and taxation for local and international clients	Accounting	🇮🇪 Dublin 6.	22	n/a
30	MCN Associates mcnassociates.ie Provider of accountancy, taxation, and financial services to personal and corporate clients globally, with a focus on cost-effective and supportive client development	Accounting	🇮🇪 Dublin 2	19	n/a
31	Nexus Chartered Accounts & Tax Advisors nexusaccounting.ie Established in 1981, our team offers a blend of experience and youthful energy, providing comprehensive accountancy and advisory services to various industries	Accounting	🇮🇪 Blackrock	18	1981
32	Shelbourne Accountants shelbourneaccountants.ie This company offers top-notch accounting and taxation services, including accountancy, bookkeeping, and customized packages to support business growth	Accounting	🇮🇪 Dublin	18	n/a
33	Exchange Accountants exchangeaccountants.com A forward-thinking firm of Chartered Certified Accountants offering digital accounting solutions, specializing in Xero, to help businesses grow and make informed decisions	Accounting	🇮🇪 Lisburn	17	2011
34	Leahy O'Riordan Chartered Accountants Limited hlb.ie Established in 1986, this Dublin-based firm offers a wide range of accountancy, tax services, and financial advice to owner-managed businesses	Accounting	🇮🇪 Dublin	16	1986
35	Marsh Mackey marshmackey.com An established accounting specialist and recruitment firm offering a wide range of services to help businesses grow with confidence Serving clients in North East Region	Accounting	🇮🇪 Navan	13	n/a
36	NKC Business & Taxations Consultants Ltd nkc.ie A client-focused accounting firm providing comprehensive services to drive business success through practical solutions and close relationships since 1998	Accounting	🇮🇪 Dublin	12	1998
37	Cahill Trautt & Co.cahilltrautt.com A well-established chartered accounting and auditing company in Ballina, Ireland, providing a range of services with 12 employees, including 7 qualified accountants	Accounting	🇮🇪 Ballina	12	1977
38	CTS \| Cahill Taxation Services cahilltaxation.ie A leading Irish consultancy providing strategic tax and business advisory services, specializing in Revenue Audits, Succession Planning, and Corporate Restructuring	Accounting	🇮🇪 Ennis	12	2007
39	Warren & Partners, a Xeinadin Company warrenp.ie An Irish tax and business advisory firm offering bespoke solutions to domestic and international clients, specializing in reducing tax liabilities and maximizing wealth	Accounting	🇮🇪 Dublin	11	1994
40	Gannon Kirwan Somerville gks.ie An independent firm offering Accountancy, Tax, and Advisory services; specializing in Audit, Accountancy, Outsourcing, Consultancy, and Taxation services under Chartered Accountants Ireland regulation	Accounting	🇮🇪 Co. Dublin	10	1981
41	James Byrne & Company forvismazars.com A reputable accounting and taxation firm in Cork and Waterford offering practical solutions for businesses across various industries	Accounting	🇮🇪 Mallow	8	1978
42	Constency constency.com An independent audit and consulting firm offering services in financial, healthcare, technology, and engineering fields to clients ranging from SMEs to large corporations	Business Consulting and Services	🇮🇪 Dublin	5	2011

Turn this list into pipeline

Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.

Build your own list, free

How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

More company lists in Ireland

The same list elsewhere

Accounting firms in the world 3,737
Accounting firms in Europe 2,855

42 leading accounting firms in Ireland

Want more companies than this list?

Turn this list into pipeline

How this list is built

More company lists in Ireland

The same list elsewhere