Fianna Fáil TD Seán Haughey has said that will not be a candidate in the next general election.
In a statement, Mr Haughey said he had informed the party organisation of Dublin Bay North of his decision.
"Having devoted all my adult life to public service, I have come to the view that now is the right time for me to step down from frontline politics," he said.
A son of former taoiseach Charles Haughey, Séan Haughey was first elected to Dublin City Council in 1985 and also served as a minister of state, a senator and lord mayor of Dublin,
Deputy Haughey said he was "proud" to "carry on a family tradition of public service in the constituency dating right back to the 1950s".
Tánaiste and Fianna Fail leader Micheál Martin paid tribute to Mr Haughey, describing him as "a man of great integrity, a fine parliamentarian and someone who takes pride in being meticulous in every aspect of his work".
"It has been a great honour to work alongside him, and I would like to extended my sincere thanks and best wishes to Seán on my own behalf, and on behalf of the Fianna Fáil organisation, as he embarks on a new chapter," Mr Martin said.
