https://www.irishgenealogy.ie/en/irish-records-what-is-available/church-records

http://www.nli.ie/

IRISH BIRTH, DEATH, AND MARRIAGE CIVIL RECORDS

Civil registration of all births, marriages and deaths in Ireland became mandatory in 1864. Non-Catholic marriages were recorded from 1845. Prior to that time, baptism and marriage records were kept at the churches. Most churches did not keep records of deaths. The civil records are all indexed by year. Beginning in 1878, they are also indexed by quarter.

Microfilm copies of these indexes are available through the LDS Family History Centers.

Once you have found an index entry that looks as though it is for the correct person, you can then order the film containing the actual record. The LDS also has microfilms of the actual birth, marriage and death records for some years. If the record isn’t available on microfilm through the LDS Family History Centers, you can write to the GRO in Ireland to obtain it.

I recommend a service provided by a company called Genfindit. Their web site is at www.genfindit.com Through them, you can order, on line, copies of civil birth, death, and marriage records. This is very convenient for those years that aren’t available on microfilm through the Family History Library.