Dublin West is a parliamentary constituency represented in Dáil Éireann, the lower house of the Irish parliament or Oireachtas.

The constituency elects five deputies (Teachtaí Dála, commonly known as TDs) on the system of proportional representation by means of the single transferable vote (PR-STV).

A by-election was held to fill the vacancy on 27 October 2011, on the same day as the Irish presidential election and two constitutional referendums.

The seat was won by the Fianna Fáil candidate Brian Lenihan Jnr, son of the deceased TD.

On 30 March 1982, Fine Gael TD Richard Burke resigned prior to his appointment as European Commissioner.