There are 43 multi-member electoral districts, known as Dáil constituencies, to elect 174 TDs to Dáil Éireann, the house of representatives of the Oireachtas, Ireland's parliament, on the system of proportional representation by means of the single transferable vote (PR-STV), to a maximum term of five years.

The total number of TDs is to be no more than one TD representing twenty thousand and no less than one TD representing thirty thousand of the population, and the ratio should be the same in each constituency, as far as practicable, avoiding malapportionment.

Any alterations to constituencies do not take effect during the life of the Dáil sitting when a revision is made.

[3] The electoral system for general elections is proportional representation by means of a single transferable vote (PR-STV).

Although they are conducted under the same rules, in the case of by-elections (where this is only one vacancy) and presidential elections, this becomes alternative vote.