Irish Ancestors /What Irish records are online?

Familysearch: The Latter-Day Saints (Mormon) website includes a partial transcript of Irish birth records 1864-1881, as well as a complete transcript of their microflims of GRO indexes up to 1922 (all-Ireland) and 1958 (Republic of Ireland). Ancestry has a copy of both.
Some of the heritage centres whose records are at Rootsireland have transcribed the local Superintendant Registrar's registers.
Assorted: Various individuals and organisations have transcribed records covering their area of interest.

Roman Catholic and Church of Ireland records for Carlow, Cork, Dublin city and Kerry.
Roman Catholic records (26 counties, not all complete): A pay-per-view search of the records (IFHF & UHF - paying).
Assorted: Various individuals and organisations have transcribed church registers covering their area of interest.

Origins.net has a complete set of Griffith's Valuation (1847-64), along with the associated Ordnance Survey maps for the 26 counties of the Republic (paying).
A complete set of Griffith's Valuation (1847-64) is available free at the Irish Library Council site, www.askaboutireland.ie.
The National Archives of Ireland genealogy site has images and transcripts of the Tithe Applotment Books for the twenty-six counties of the Republic.
Landed Estate Court Records are at Findmypast.ie.
Assorted: Various individuals and organisations have transcribed Griffith's and Tithe Applotment books covering their area of interest.

The Ulster Historical Foundation (UHF) has the Calendars of Wills and Administrations from 1858 to 1900 (paying). The Calendars for areas now in Northern Ireland are available at the Public Record Office of Northern Ireland, linked to images of any surviving pre-1922 transcripts for Armagh, Belfast or Londonderry district registries
Origins and Findmypast.ie each have a copy of the National Archives of Ireland index to wills (paying). Findmypast.ie also has a large collection of printed wills indexes.
The National Archives of Ireland has transcripts and images of its will calendars from 1922 to 1982, as well as a complete database transcript with accompanying pdf images at willcalendars.nationalarchives.ie
Assorted: Various individuals and organisations have transcribed will indexes covering their area of interest.

Ellis Island has arrivals records for the port of New York from 1897.
Castle Garden has arrivals records for the port of New York from 1830.
The U.S National Archives has a database of Irish Famine immigrants to New York, 1846-51.
The Immigrant Ships Transcribers Guild includes a vast range of passenger lists.
Ancestry has a large collection of passenger lists. A good guide is at genealogybranches.com.
Steve Morse provides excellent one-step free searches for everything online for the U.S.

The Irish Times has a relatively complete archive from 1859.
Irish Newspaper archives has the Freemans' Journal from 1763, The Irish Independent from 1905, The Irish Press from 1931 to 1995, and many twentieth-century provincial papers.
Biographical information from the Belfast News-letter is extracted from 1737 to 1800.
The British Newspaper Archive has The Freeman's Journal from 1820 to 1900, The Cork Examiner from 1840 to 1846 and 1923 to 1926, and The Belfast News-Letter from 1828 to 1900.

Cork Past and Present has Cork city and county directories from 1787 to 1945.
PRONI has a superb collection of Belfast and Ulster directories.
Irish Family Research has transcribed a number of local 19th century trade directories (paying).
Assorted: Various individuals and organisations have transcribed directories or parts of directories covering their area of interest.
Failte Romhat has Pigot's (1824), Pettigrew & Oulton's (Dublin, 1842), Slater's (1846), Taylor and Skinner's Road Maps of Ireland (1778).
Google Books has Thom's Dublin Directory of 1850 and 1852.
FindMyPast has a large collection of directories.

Links last checked January 23 2013