Records of members of the Oireachtas

This is a list of records relating to the Oireachtas (National Parliament of Ireland). The First Dáil Éireann consisted of the Sinn Féin MPs who were elected in the United Kingdom general election of 14 December 1918. They refused to attend the British House of Commons and instead assembled for the first time on 21 January 1919 in the Mansion House in Dublin as the revolutionary unicameral Dáil Éireann.

1118 Teachtaí Dála (TDs) served in the Dáil between 1919 and 2003. The title Father of the Dáil is usually and unofficially conferred on the longest-serving member.

This is a list of former TDs who have served at least 30 years in the Dáil. Unless otherwise specified, start and end dates given are those of the relevant general election. It can be assumed unless stated otherwise that the member did not stand in the end-date election, as opposed to standing and failing to be elected.

This is a list of former TDs who served for less than 1 year in the Dáil. Unless otherwise specified, start and end dates given are those of the relevant general election.

The following were eligible for membership of the Dáil, but as Unionists, they did not recognise it. Those elected to Westminster in 1918 were eligible for the First Dáil.

This is a list of current members of the Oireachtas who have served for at least 20 years, with continuous or broken service. Unless otherwise specified, start dates given are those of the relevant election.

This is a list of current and former Senators who have served for at least 20 years in the Seanad, including both the Free State Seanad and the Seanad established under the 1937 Constitution. There was a 22-month gap between the abolition of the Free State Seanad in 1936 and the inauguration in 1938 of the 2nd Seanad, the first incarnation of the new body.

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