A foreign national living in Ireland who meets certain standards may apply to become a "naturalised" Irish citizen. To apply, you must have been physically resident in Ireland for a certain length of time.
The conditions for Naturalisation were set out in the Irish Nationality and Citizenship Act 1956 as amended. These are:
You must be over 18.
You can apply on behalf of a child if
the child was born in Ireland after 1 January 2005 and did not qualify for citizenship by birth – use Form 11 on the INIS website
the child is of Irish descent – use Form 10 on the INIS website
the parent is a naturalised citizen – use Form 9 on the INIS website
You must be ‘of good character.’ To prove this, you must ask the Garda Síochána for a report about your background.
Residence in the State
You must have lived in the State for a certain length of time. You must:
have a period of 365 days* (1 year) continuous residence in the State immediately before the date of your application for naturalisation
have spent 1,460 day, or 4 years, in the State in the 8 years before that
You must have spent 5 of the past 9 years in residence in Ireland.
You can spend up to 6 weeks per year outside of Ireland and still be considered a resident. If you had to leave Ireland for longer than 6 weeks because of an emergency, you should explain this in your application.
If you spend more than 6 weeks outside of Ireland in the year immediately before your application, you may have to wait until the following year to make an application.