The Institution of Engineers of Ireland (Irish: Cumann na nInnealtóirí) or the IEI, is the second oldest engineering society in the British Isles established in 1835 and currently representing over 20,000 members, primarily in Ireland, the Institution accepted its current name in 1969 by an Act of the Oireachtas. Membership of the institution is open to individuals based on academic and professional background and is separated into grades in accordance with criteria.
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Originally set up as The Institution of Civil Engineers of Ireland it received a Royal Charter on October 15th 1877, this been a significant milestone in obtaining international recognition and standing. In the early years of the Irish Free State Cumann na nInnealtoiri (The Engineers Association) was set up independently, in 1928, by incorporation under the Companies Act, 1908.
As time progressed it was realised that the institution and association might better advance engineering in Ireland by amalgamation of both into an organisation which might better advance the two organisations goals and represent a broader set of engineering disciplines, this was done by The Institution of Civil Engineers of Ireland (Charter Amendment) Act, 1969 leading to the creation of The Institution of Engineers of Ireland - Cumann na nInnealtóirí as it is currently designated.
"The Institution promotes the art and science of engineering...", in particular:
In accordance with EU regulations it is the designated authority for the engineering profession in Ireland. The Institution is a national member of European Federation of National Engineering Associations (FEANI). The Institution is also a signator to a number of international agreements, these are principally for registered professional titles and accredited engineering programmes, for academic programmes1 these are:
| Year | Agreement | Qualification | Practitioner |
| 1989 | The Washington Accord [1] (http://www.washingtonaccord.org) | Accredited Engineering Degree | Engineer |
| 2001 | The Sydney Accord | National Diploma in Engineering | Technologist |
| 2002 | The Dublin Accord | National Certificate in Engineering | Technician |
1) This table is only a summary, for detailed information on acceptable qualifications contact the Institution.