Catholic Parish Registers
For most family history researchers, parish registers provide the earliest direct source of family information. Unlike many other records, parish registers provide evidence of direct links between one generation and the next (via baptismal registers) and one family and another (via marriage registers). They are also, for the majority of Irish people who lived during the 18th and 19th centuries, the only record of their existence.
The NLI microfilmed registers from the majority of Catholic parishes in Ireland and Northern Ireland during the 1950s and 1960s. Digital images from these microfilms are now freely available on the website: Catholic Parish Registers at the NLI.