# 42 leading accounting firms in Ireland

Tamtam tracks 42 accounting firms headquartered in Ireland. This list ranks all of them by number of employees on LinkedIn, led by KPMG Ireland, Grant Thornton Ireland and PwC Ireland. Their median headcount is 47. Half of them were founded in 1988 or later. The most common headquarters are Dublin (20).

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.

🇮🇪 Ireland · 42 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [KPMG Ireland](https://www.tamtam.ai/c/kpmg-ireland) (kpmg.ie)<br>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 |  |
| 2 | [Grant Thornton Ireland](https://www.tamtam.ai/c/grant-thornton-ireland) (grantthornton.ie)<br>Providing innovative financial and business solutions with local expertise and global reach, fostering client relationships and ethical practices. | Professional Services | 🇮🇪 Dublin | 2,514 |  |
| 3 | [PwC Ireland](https://www.tamtam.ai/c/pwc-ireland) (pwc.ie)<br>Global network providing assurance, advisory, and tax services with a commitment to quality and building trust in society. | Professional Services | 🇮🇪 Dublin | 2,502 |  |
| 4 | [S&W Ireland](https://www.tamtam.ai/c/s-and-w-ireland) (swgroup.com)<br>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](https://www.tamtam.ai/c/deloitte-ireland) (deloitte.com)<br>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 |  |
| 6 | [My Office](https://www.tamtam.ai/c/my-office) (myoffice.ie)<br>Providing affordable bookkeeping and administration services for businesses, helping them be more efficient and save time and money | Accounting | 🇮🇪 Ennis | 748 |  |
| 7 | [Forvis Mazars In Ireland](https://www.tamtam.ai/c/forvis-mazars-in-ireland) (forvismazars.com)<br>provides audit, tax, consulting, financial advisory, corporate finance, and outsourcing services to international corporates, SMEs, financial institutions, and public bodies | Accounting | 🇮🇪 | 739 |  |
| 8 | [BDO Ireland](https://www.tamtam.ai/c/bdo-ireland) (bdo.ie)<br>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](https://www.tamtam.ai/c/xeinadin-ireland) (xeinadin.ie)<br>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](https://www.tamtam.ai/c/rsm-ireland) (rsmireland.ie)<br>A leading firm in audit, tax, and consulting services with over 200 staff and 3 offices in Ireland Recognized for excellence | Accounting | 🇮🇪 Dublin | 261 |  |
| 11 | [OSK](https://www.tamtam.ai/c/osk-dublin) (osk.ie)<br>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](https://www.tamtam.ai/c/crowe-ireland) (crowe.com)<br>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](https://www.tamtam.ai/c/dm-financial) (dmfinancial.com)<br>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](https://www.tamtam.ai/c/fpm) (fpmaab.com)<br>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](https://www.tamtam.ai/c/pkf-brenson-lawlor) (pkfbrensonlawlor.ie)<br>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](https://www.tamtam.ai/c/baker-tilly-ireland) (bakertilly.ie)<br>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)](https://www.tamtam.ai/c/frame-formerly-bkk) (frame.international)<br>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](https://www.tamtam.ai/c/o-neill-foley) (onf.ie)<br>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](https://www.tamtam.ai/c/bfcd) (bfcd.ie)<br>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](https://www.tamtam.ai/c/taxassist-accountants-ireland) (taxassist.ie)<br>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](https://www.tamtam.ai/c/cooney-carey) (cooneycarey.ie)<br>A leading advisory firm providing auditing, taxation, company secretarial, and business advisory services with over 25 years of experience | Accounting | 🇮🇪 Sandyford | 47 | 1983 |
| 22 | [KBG Accountants](https://www.tamtam.ai/c/kbg-accountants) (kbg.ie)<br>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](https://www.tamtam.ai/c/walsh-o-brien-harnett) (wobh.ie)<br>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](https://www.tamtam.ai/c/hill-vellacott) (hillvellacott.com)<br>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 |  |
| 25 | [O'Connor Pyne & Co. Limited](https://www.tamtam.ai/c/o-connor-pyne-and-co-limited) (oconnorpyne.ie)<br>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](https://www.tamtam.ai/c/tynan-dillon-xeinadin-group) (tynandillon.ie)<br>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 |  |
| 27 | [DJH Ireland](https://www.tamtam.ai/c/djh-ireland) (msdaccountants.com)<br>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](https://www.tamtam.ai/c/ksi-faulkner-orr-ireland) (ksifo.ie)<br>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](https://www.tamtam.ai/c/lhm-casey-mcgrath) (lhmcaseymcgrath.ie)<br>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 |  |
| 30 | [MCN Associates](https://www.tamtam.ai/c/mcn-associates) (mcnassociates.ie)<br>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 |  |
| 31 | [Nexus Chartered Accounts & Tax Advisors](https://www.tamtam.ai/c/nexus-chartered-accounts-and-tax-advisors) (nexusaccounting.ie)<br>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](https://www.tamtam.ai/c/shelbourne-accountants) (shelbourneaccountants.ie)<br>This company offers top-notch accounting and taxation services, including accountancy, bookkeeping, and customized packages to support business growth | Accounting | 🇮🇪 Dublin | 18 |  |
| 33 | [Exchange Accountants](https://www.tamtam.ai/c/exchange-accountants) (exchangeaccountants.com)<br>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](https://www.tamtam.ai/c/leahy-o-riordan-chartered-accountants-limited) (hlb.ie)<br>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](https://www.tamtam.ai/c/marsh-mackey) (marshmackey.com)<br>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 |  |
| 36 | [NKC Business & Taxations Consultants Ltd](https://www.tamtam.ai/c/nkc-business-and-taxations-consultants-ltd) (nkc.ie)<br>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.](https://www.tamtam.ai/c/cahill-trautt-and-co) (cahilltrautt.com)<br>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](https://www.tamtam.ai/c/cts-cahill-taxation-services) (cahilltaxation.ie)<br>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](https://www.tamtam.ai/c/warren-and-partners-a-xeinadin-company) (warrenp.ie)<br>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](https://www.tamtam.ai/c/gannon-kirwan-somerville) (gks.ie)<br>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](https://www.tamtam.ai/c/james-byrne-and-company) (forvismazars.com)<br>A reputable accounting and taxation firm in Cork and Waterford offering practical solutions for businesses across various industries | Accounting | 🇮🇪 Mallow | 8 | 1978 |
| 42 | [Constency](https://www.tamtam.ai/c/constency) (constency.com)<br>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 |

## 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 largest companies in Ireland](https://www.tamtam.ai/l/largest-companies-ireland) (1,769)
- [Multinational companies in Ireland](https://www.tamtam.ai/l/multinational-companies-ireland) (564)
- [SaaS companies in Ireland](https://www.tamtam.ai/l/saas-companies-ireland) (203)
- [Software Development companies in Ireland](https://www.tamtam.ai/l/software-development-companies-ireland) (176)
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- [Financial services firms in Ireland](https://www.tamtam.ai/l/financial-services-firms-ireland) (143)
- [Financial Services companies in Ireland](https://www.tamtam.ai/l/financial-services-companies-ireland) (143)
- [Professional services firms in Ireland](https://www.tamtam.ai/l/professional-services-firms-ireland) (126)
- [Manufacturers in Ireland](https://www.tamtam.ai/l/manufacturers-ireland) (125)
- [Companies with in-house R&D in Ireland](https://www.tamtam.ai/l/r-and-d-companies-ireland) (120)
- [Critical infrastructure operators in Ireland](https://www.tamtam.ai/l/critical-infrastructure-operators-ireland) (118)
- [Companies with a mobile app in Ireland](https://www.tamtam.ai/l/companies-with-mobile-app-ireland) (99)
- [Public sector organisations in Ireland](https://www.tamtam.ai/l/public-sector-organisations-ireland) (88)
- [Retail companies in Ireland](https://www.tamtam.ai/l/retail-companies-ireland) (84)
- [Education providers in Ireland](https://www.tamtam.ai/l/education-companies-ireland) (83)
- [IT Services and IT Consulting companies in Ireland](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-ireland) (83)
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- [Consulting firms in Ireland](https://www.tamtam.ai/l/consulting-firms-ireland) (65)
- [Family-owned companies in Ireland](https://www.tamtam.ai/l/family-owned-companies-ireland) (64)
- [Distributors and wholesalers in Ireland](https://www.tamtam.ai/l/distributors-and-wholesalers-ireland) (63)
- [Subscription businesses in Ireland](https://www.tamtam.ai/l/subscription-businesses-ireland) (62)
- [Hardware manufacturers in Ireland](https://www.tamtam.ai/l/hardware-companies-ireland) (61)

## The same list elsewhere

- [Accounting firms in the world](https://www.tamtam.ai/l/accounting-firms-in-the-world) (3,737)
- [Accounting firms in Europe](https://www.tamtam.ai/l/accounting-firms-in-europe) (2,855)

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Source: https://www.tamtam.ai/l/accounting-firms-ireland