These Dublin-based public sector organizations primarily span education, healthcare, and utilities. The list includes large established entities like University College Dublin, a research-intensive university founded in 1854, and Trinity College Dublin, recognized globally for academic excellence since 1592. Also featured are ESB, providing secure and sustainable electricity, and Beaumont Hospital, a leading teaching hospital. The Central Bank of Ireland safeguards monetary stability, while Enterprise Ireland supports Irish businesses in international markets.
A notable pattern among these organizations is their long-standing presence; many were founded in the 19th or early 20th centuries. The concentration of headquarters in Dublin highlights the city's role as a central hub for public services and administration in Ireland.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
University College Dublinucd.ie
Research-intensive university offering undergraduate, masters, PhD education, fostering innovation, global engagement, and diverse academic disciplines across multiple campuses. |
8,585 | |||
| 2 |
Trinity College Dublintcd.ie
Leading Irish university offering world-class education and research, recognized globally for academic excellence and high international rankings. |
7,268 | |||
| 3 | 4,937 | ||||
| 4 |
Beaumont Hospitalbeaumont.ie
A leading teaching hospital associated with RCSI Hospital Group, serving as a designated cancer and regional treatment center with strong academic links |
3,349 | |||
| 5 |
An Postanpost.com
Provides postal, communication, retail, and financial services across Ireland with a large national network and over 10,000 employees. |
3,117 | |||
| 6 |
St James's Hospital Dublinlinkin.bio
An academic teaching hospital delivering health treatment, care, and diagnosis while prioritizing education, research, and collaboration with a focus on quality and accountability |
2,788 | |||
| 7 | 2,741 | ||||
| 8 |
Uisce Éireann Irish Waterwater.ie
National water utility ensuring secure, safe, and sustainable water services in Ireland by delivering quality drinking water and treating wastewater responsibly |
2,229 | |||
| 9 |
Iarnród Éireann Irish Railirishrail.ie
The national railway system operator in Ireland, providing intercity, commuter, and freight services within the Republic of Ireland and to Belfast |
2,157 | |||
| 10 |
Central Bank of Irelandcentralbank.ie
Safeguarding monetary and financial stability, ensuring financial system benefits consumers and economy, maintaining independence and public trust. |
1,983 | |||
| 11 |
Enterprise Irelandenterprise-ireland.com
Supporting Irish enterprises in international markets through development, growth, innovation, and export sales to drive employment and economic growth |
1,475 | |||
| 12 |
Children’s Health Ireland (CHI)childrenshealthireland.ie
A leading children's hospital in Ireland with over 280 beds and 39 specialties, offering educational opportunities, support for career development, and various employee benefits |
1,430 | |||
| 13 |
Dublin Bus (Bus Átha Cliath)dublinbus.ie
Leading public transport provider in Ireland with a fleet of over 1000 buses operating on 125 routes, employing 3,600 people from 71 countries |
1,126 | |||
| 14 |
ESB Networksesbnetworks.ie
A subsidiary of ESB Group in Republic of Ireland operating and maintaining electricity distribution system, facilitating competitive market, and investing in network development |
1,113 | |||
| 15 |
SOLAS (An tSeirbhís Oideachais Leanúnaigh agus Scileanna)solas.ie
Leading authority in Ireland for funding, planning, and coordinating training programs, ensuring high-quality education for jobseekers and learners through partnerships with stakeholders |
987 | |||
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. | |||||
| 16 |
Bus Éireannbuseireann.ie
A major provider of bus transportation services in Ireland, offering a wide range of inter-urban, city, commuter, school, and local bus services |
910 | |||
| 17 |
Fáilte Irelandfailteireland.ie
The company supports and promotes Ireland as a competitive tourism destination, offering business supports, marketing services, and managing tourist information centers nationwide |
625 | |||
| 18 |
National Treasury Management Agencyntma.ie
The company provides asset and liability management services to the Government, including borrowing, debt management, and support services for various entities |
623 | |||
| 19 | 524 | ||||
| 20 |
Connolly Hospital Blanchardstownhse.ie
This hospital in Blanchardstown provides healthcare services, medical treatments, and facilities to local residents and patients in need |
497 | |||
| 21 |
National Transport Authoritynationaltransport.ie
Supervision and regulation of public passenger transport services, multi-modal ticketing, strategic planning, and sustainable transport project funding across Ireland. |
490 | |||
| 22 |
Dublin Airportlinktr.ee
A major international airport located in Dublin, Ireland, serving as the primary entry point for millions of passengers annually Part of the daa Group |
484 | |||
| 23 |
Dún Laoghaire Institute of Art, Design and Technologyiadt.ie
Leader in higher education specializing in developing future innovators in digital world through various programs Discover opportunities for your future today |
482 | |||
| 24 |
ESB Internationalesbinternational.ie
A global engineering consultancy firm serving the utility sector, specializing in delivering large-scale projects to maximize investor returns and minimize project risk |
413 | |||
| 25 |
National College of Art & Designncad.ie
Leading provider of art and design education in Ireland for over 250 years, offering undergraduate, graduate, and part-time programs across various disciplines |
412 | |||
| 26 |
Temple Street Children’s University Hospitalcuh.ie
A national pediatric hospital specializing in various medical fields, caring for 145,000 children annually with a team of over 1,000 healthcare professionals |
411 | |||
| 27 |
Tourism Irelandtourismireland.com
Marketing the island of Ireland as a top holiday and Business Events destination globally, with offices in key international markets and on the island |
410 | |||
| 28 |
Health Products Regulatory Authority (HPRA)hpra.ie
Regulating medicines and devices for people and animals, the company offers information on current vacancies for those interested in working with them |
400 | |||
| 29 |
Irish Aviation Authorityiaa.ie
Leading civil aviation regulator in Ireland ensuring safety, security, and consumer interests in compliance with global, European, and national regulations |
393 | |||
| 30 |
Dublin Fire Brigadedublincity.ie
Providing 24/7 Fire, Ambulance & Rescue services in Dublin with Firefighters, Paramedics, and Advanced Paramedics available to respond to emergencies |
358 | |||
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.
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 867
- Multinational companies in Dublin 287
- SaaS companies in Dublin 119
- Software Development companies in Dublin 96
- Retail chains in Dublin 86
- Financial services firms in Dublin 85
- Financial Services companies in Dublin 81
- Professional services firms in Dublin 75
- Critical infrastructure operators in Dublin 66
- Companies with a mobile app in Dublin 64
- IT Services and IT Consulting companies in Dublin 47
- IT services companies in Dublin 44
- Companies with in-house R&D in Dublin 43
- Consulting firms in Dublin 42
- Retail companies in Dublin 39
- Subscription businesses in Dublin 35
- Education providers in Dublin 33
- AI companies in Dublin 31
- Healthcare providers in Dublin 31
- Government Administration companies in Dublin 30
- Construction companies in Dublin 27
- Hospitals and Health Care companies in Dublin 27
- Publicly traded companies in Dublin 27
- Insurance companies in Dublin 25