# List of consulting firms in Dublin

Tamtam tracks 42 consulting firms headquartered in Dublin. This list ranks the 30 largest by number of employees on LinkedIn, led by Accenture, ICON plc and PM Group. Their median headcount is 409. Half of them were founded in 1985 or later.

These Dublin-based companies are predominantly large to mid-sized professional services firms, with a strong presence in business consulting, IT services, and accounting. Accenture, with its focus on digital transformation, and ICON plc, specializing in drug and device development, represent the larger end of the spectrum. Other significant firms include PM Group, which designs high-tech facilities, and Version 1, an IT solutions provider.

The data shows a clear concentration of companies offering specialized expertise across various sectors. Many firms, such as KPMG Ireland and Grant Thornton Ireland, provide audit, tax, and advisory services to both domestic and international clients, highlighting Dublin's role as a hub for professional and business support services.

🇮🇪 Dublin · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Accenture](https://www.tamtam.ai/c/accenture) (accenture.com)<br>It provides professional services to businesses and governments, focusing on digital transformation, operational optimization, and enhancing citizen services globally. | Business Consulting and Services | 🇮🇪 Dublin | 687,682 |  |
| 2 | [ICON plc](https://www.tamtam.ai/c/icon-plc) (iconplc.com)<br>A global company founded in Ireland in 1990, specializing in accelerating the development of drugs and devices to save lives and improve quality of life | Biotechnology Research | 🇮🇪 Dublin | 35,001 |  |
| 3 | [PM Group](https://www.tamtam.ai/c/pm-group) (pmgroup-global.com)<br>Specializes in designing, constructing, and commissioning high-tech facilities for pharma, food, data centers, medical technology, manufacturing, and energy sectors globally. | Business Consulting and Services | 🇮🇪 Dublin | 4,477 | 1973 |
| 4 | [Version 1](https://www.tamtam.ai/c/version-1) (version1.com)<br>IT services and solutions provider trusted by global brands, offering independent advice to navigate the evolving IT landscape and drive customer success | IT Services and IT Consulting | 🇮🇪 Dublin | 3,944 | 1996 |
| 5 | [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 |  |
| 6 | [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 |  |
| 7 | [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 |  |
| 8 | [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 |
| 9 | [Covalen](https://www.tamtam.ai/c/covalen-dublin) (covalensolutions.com)<br>A trusted partner providing agile outsourcing solutions to Fortune 500 companies, offering multilingual services in customer experience, operations, and trust & safety | Outsourcing and Offshoring Consulting | 🇮🇪 Dublin | 2,030 |  |
| 10 | [Linesight](https://www.tamtam.ai/c/linesight) (linesight.com)<br>Provides professional consultancy, management support, and strategic advice to the global construction industry from concept to completion across diverse sectors worldwide. | Construction | 🇮🇪 Dublin | 1,931 | 1974 |
| 11 | [KSN](https://www.tamtam.ai/c/ksn) (ksn.ie)<br>An Irish-owned consultancy practice offering expert quantity surveying, cost management, and sustainability advice to maximize potential return for clients | Construction | 🇮🇪 Dublin | 569 | 1989 |
| 12 | [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 |
| 13 | [CAE Parc Aviation](https://www.tamtam.ai/c/cae-parc-aviation) (cae.com)<br>A global aviation services company offering flight crew, aircraft support, MRO services, and job opportunities in various roles within the industry | Airlines and Aviation | 🇮🇪 Dublin | 428 | 1975 |
| 14 | [ESB International](https://www.tamtam.ai/c/esb-international) (esbinternational.ie)<br>A global engineering consultancy firm serving the utility sector, specializing in delivering large-scale projects to maximize investor returns and minimize project risk | Utilities | 🇮🇪 Dublin | 413 | 1975 |
| 15 | [ORS](https://www.tamtam.ai/c/ors) (ors.ie)<br>Leading provider of multidisciplinary design and build services, specializing in civil, structural engineering, project management, health and safety, and energy management for diverse clients. | Construction | 🇮🇪 Dublin | 409 | 1991 |
| 16 | [Codec](https://www.tamtam.ai/c/codec) (codec.ie)<br>A leading technology company specializing in Microsoft low-code platform solutions for Public and Healthcare sectors, with a focus on innovation and sustainability | IT Services and IT Consulting | 🇮🇪 Dublin | 339 | 1985 |
| 17 | [HPC](https://www.tamtam.ai/c/hpc-dublin) (wearehpc.com)<br>A people development company based in Dublin and Belfast, working with organizations to create high performance cultures through bespoke programs and services | Professional Training and Coaching | 🇮🇪 Dublin | 332 | 1982 |
| 18 | [Nicholas O'Dwyer Ltd](https://www.tamtam.ai/c/nicholas-o-dwyer-ltd) (nodwyer.com)<br>A global consulting engineering firm offering water, environmental, civil, and structural engineering services for sustainable infrastructure projects in various sectors worldwide | Environmental Services | 🇮🇪 Dublin | 325 | 1932 |
| 19 | [Ethos Engineering](https://www.tamtam.ai/c/ethos-engineering) (ethoseng.ie)<br>A leading mechanical and electrical consultancy providing services to various sectors, known for sustainability, innovation, and award-winning projects and workplace culture | Engineering Services | 🇮🇪 Dublin | 318 | 2005 |
| 20 | [GDCL Consulting Engineers](https://www.tamtam.ai/c/gdcl-consulting-engineers) (gdalyconsulting.com)<br>Provider of civil and structural engineering services, specializing in BIM models, with a track record of successful delivery to local and international clients | Civil Engineering | 🇮🇪 Dublin | 315 | 2011 |
| 21 | [Ireland INC](https://www.tamtam.ai/c/ireland-inc) (irelandinc.com)<br>A forum facilitating Irish companies' expansion and investment in the US, offering consultancy on growth strategies and hosting events to showcase Irish corporate presence | Government Relations Services | 🇮🇪 Dublin | 314 | 2009 |
| 22 | [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 |  |
| 23 | [Auxilion](https://www.tamtam.ai/c/auxilion) (auxilion.com)<br>Award-winning consulting and IT services provider focusing on digital transformation, project management, Microsoft solutions, modern workplace, resourcing, and managed services | IT Services and IT Consulting | 🇮🇪 Dublin | 238 | 2012 |
| 24 | [Institute of Public Administration](https://www.tamtam.ai/c/institute-of-public-administration) (ipa.ie)<br>Dedicated to advancing public administration and policy through education, training, consultancy, and research services for public servants in Ireland and abroad | Education | 🇮🇪 Dublin | 196 | 1957 |
| 25 | [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 |
| 26 | [Bluewave Technology](https://www.tamtam.ai/c/bluewave-technology) (bluewavecx.com)<br>Award-winning Salesforce consulting partner offering development, training, implementation, and integration services mainly in Ireland and the UK. | IT Services and IT Consulting | 🇮🇪 Dublin | 79 | 2000 |
| 27 | [UDG Healthcare (now Inizio)](https://www.tamtam.ai/c/udg-healthcare-now-inizio) (inizio.health)<br>Inizio is a strategic partner in health and life sciences, offering advisory, medical, marketing, communications, and patient engagement services throughout the drug lifecycle | Pharmaceutical Manufacturing | 🇮🇪 Dublin | 79 |  |
| 28 | [ProStrategy](https://www.tamtam.ai/c/prostrategy) (prostrategy.ie)<br>Provider of business management software solutions & services, specializing in data analytics, ERP, CRM, and IT services to empower clients' success | IT Services and IT Consulting | 🇮🇪 Dublin | 78 | 1985 |
| 29 | [Invicara](https://www.tamtam.ai/c/invicara) (twinit.com)<br>Invicara provides software for building, infrastructure and cities, creating digital twins to optimize asset management and efficiency for businesses | Software Development | 🇮🇪 Dublin | 74 | 2012 |
| 30 | [Agile Executives](https://www.tamtam.ai/c/agile-executives) (agileexecutives.ie)<br>The Agile Executive helps business owners increase turnover, improve cashflow, and enhance company value by matching them with experienced executives and partners | Business Consulting and Services | 🇮🇪 Dublin | 54 | 2019 |

## 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 11, 2026.

## More company lists in Dublin

- [The largest companies in Dublin](https://www.tamtam.ai/l/largest-companies-dublin) (867)
- [Multinational companies in Dublin](https://www.tamtam.ai/l/multinational-companies-dublin) (287)
- [SaaS companies in Dublin](https://www.tamtam.ai/l/saas-companies-dublin) (119)
- [Software Development companies in Dublin](https://www.tamtam.ai/l/software-development-companies-dublin) (96)
- [Retail chains in Dublin](https://www.tamtam.ai/l/retail-chains-dublin) (86)
- [Financial services firms in Dublin](https://www.tamtam.ai/l/financial-services-firms-dublin) (85)
- [Financial Services companies in Dublin](https://www.tamtam.ai/l/financial-services-companies-dublin) (81)
- [Professional services firms in Dublin](https://www.tamtam.ai/l/professional-services-firms-dublin) (75)
- [Critical infrastructure operators in Dublin](https://www.tamtam.ai/l/critical-infrastructure-operators-dublin) (66)
- [Companies with a mobile app in Dublin](https://www.tamtam.ai/l/companies-with-mobile-app-dublin) (64)
- [IT Services and IT Consulting companies in Dublin](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-dublin) (47)
- [IT services companies in Dublin](https://www.tamtam.ai/l/it-services-companies-dublin) (44)
- [Companies with in-house R&D in Dublin](https://www.tamtam.ai/l/r-and-d-companies-dublin) (43)
- [Public sector organisations in Dublin](https://www.tamtam.ai/l/public-sector-organisations-dublin) (41)
- [Retail companies in Dublin](https://www.tamtam.ai/l/retail-companies-dublin) (39)
- [Subscription businesses in Dublin](https://www.tamtam.ai/l/subscription-businesses-dublin) (35)
- [Education providers in Dublin](https://www.tamtam.ai/l/education-companies-dublin) (33)
- [AI companies in Dublin](https://www.tamtam.ai/l/ai-companies-dublin) (31)
- [Healthcare providers in Dublin](https://www.tamtam.ai/l/healthcare-providers-dublin) (31)
- [Government Administration companies in Dublin](https://www.tamtam.ai/l/government-administration-companies-dublin) (30)
- [Construction companies in Dublin](https://www.tamtam.ai/l/construction-companies-dublin) (27)
- [Hospitals and Health Care companies in Dublin](https://www.tamtam.ai/l/hospitals-and-health-care-companies-dublin) (27)
- [Publicly traded companies in Dublin](https://www.tamtam.ai/l/publicly-traded-companies-dublin) (27)
- [Insurance companies in Dublin](https://www.tamtam.ai/l/insurance-companies-dublin) (25)

## The same list elsewhere in Ireland

- [Consulting firms in Ireland](https://www.tamtam.ai/l/consulting-firms-ireland) (65)

---

Source: https://www.tamtam.ai/l/consulting-firms-dublin