This is a list of records relating to the Oireachtas, the national parliament of Ireland, which consists of the President of Ireland, and two Houses, Dáil Éireann, a house of representatives whose members are known as Teachtaí Dála or TDs, and Seanad Éireann, a senate whose members are known as senators.

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The First Dáil 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.

1,292 TDs have served in the Dáil between 1919 and 2018. 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. Unless stated, the TD listed did not stand in the end-date election.

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.^[1]

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.

•   denotes serving senator

Aged 85 or older:

Office holders aged 75 or older:

Aged 90 or more at time of death:

Aged 40 or younger at time of death:

This table lists the shortest periods that a member of government held a particular ministerial office. In some of these cases, the minister held it as well as another ministerial office, being appointed after the resignation of another member of government. Acting Ministers are not listed. Jim McDaid, who was proposed as Minister for Defence on 13 November 1991, but whose name was withdrawn later that day, is not included.^[2][3]

Politicians born before 1954:

Politicians born since 1984:

This lists those with a separate mandate to the Oireachtas and the British parliament, and therefore does not include members of the 1st Dáil.

Notes:

^R Sat as an Irish representative peer under the Act of Union 1800

^H Sat as an Hereditary peer

^L Sat as a Life peer

Party leaders serving 10 years or more:

• Families in the Oireachtas
• List of Irish politicians
• List of Irish politicians who changed party affiliation
• List of members of the Oireachtas imprisoned since 1923
• List of members of the Oireachtas imprisoned during the Irish revolutionary period
• List of female cabinet ministers of the Republic of Ireland
• List of female members of Dáil Éireann
• List of female members of Seanad Éireann
• Records of Irish heads of government since 1922
• First women holders of political offices in Ireland
• List of members of Seanad Éireann who died in office
• List of members of Dáil Éireann who died in office