The 2020 Irish general election took place on Saturday 8 February, to elect the 33rd Dáil, the lower house of Ireland's parliament. The election was called following the dissolution of the 32nd Dáil by the president, at the request of the Taoiseach, Leo Varadkar, on 14 January 2020. The members, Teachtaí Dála (TDs), were elected by single transferable vote in multi-seat constituencies. It was the first election since 1918 to be held on a weekend. Following the election, Fine Gael and Fianna Fáil entered into a historic coalition government.

The election was an unprecedented three-way race, with the three largest parties each winning a share of the vote between 20% and 25%. Fianna Fáil finished with 38 seats (including one TD returned automatically as outgoing Ceann Comhairle). Sinn Féin made significant gains; it received the most first-preference votes, and won 37 seats, the party's best result since 1923. Fine Gael, the governing party led by Varadkar, came third both in seats (35) and in first-preference votes. International news outlets have described the result as a historic break from the two-party system, as it was the first time in almost a century that neither Fianna Fáil nor Fine Gael won the most votes. Furthermore, the combined vote share of the two traditional main parties fell to a historic low. The leaders of those parties had long ruled out forming a coalition government with Sinn Féin.

The 33rd Dáil first met on 20 February. The outgoing Ceann Comhairle, Seán Ó Fearghaíl of Fianna Fáil, was re-elected, reducing to 37 the number of Fianna Fáil TDs. Four candidates were proposed for the position of Taoiseach, but none were successful. Varadkar formally resigned as Taoiseach that day as he was constitutionally obliged to do, but he and the other members of the government continued to carry out their duties until the appointment of their successors. Negotiations to form a new government continued through to June, impacted by the arrival of the COVID-19 pandemic in Ireland. A Programme for Government agreed by Fianna Fáil, Fine Gael and the Green Party was published on 15 June 2020. On 26 June, all three parties voted to enter government under the Programme for Government. On 27 June, Micheál Martin was appointed as Taoiseach and formed a new government. The parties agreed that in December 2022, Varadkar would serve again as Taoiseach.

Since the 2016 Irish general election, Fine Gael had led a minority government with the support of Independent TDs, including the Independent Alliance. It relied on a confidence and supply agreement with Fianna Fáil.

On 3 December 2019, a motion of no confidence in the Minister for Housing, Planning and Local Government Eoghan Murphy proposed by Catherine Murphy for the Social Democrats was defeated, with 53 votes in favour to 56 votes against and 35 registered abstentions. On 9 January 2020, Independent TD Michael Collins called for a motion of no confidence in the Minister for Health Simon Harris. On 14 January, Taoiseach Leo Varadkar sought a dissolution of the Dáil which was granted by the president, with the 33rd Dáil to convene on 20 February at 12 noon. The election was set for 8 February, the first time a general election was held on a Saturday since 1918.

Members of Dáil Éireann known as TDs (Dáil deputies) were elected by single transferable vote (STV) from 39 constituencies with between three and five seats. Voters complete a paper ballot, numbering candidates 1, 2, 3, etc. in order of their preference. Ballot boxes are sent to the constituency count centre after polls close and are counted the following morning. Voters may mark as many or as few preferences as they wish. Each ballot is initially credited to its first-preference candidate but if the first preference candidate is elected or eliminated on later counts, the vote may be transferred to the next usable preference, in which case it is not used to elect the candidate marked as the first preference. (The vote is only used to elect one candidate in the end or none at all.) The whole-vote method is used for transfers of surplus votes held by elected candidates. As the outgoing Ceann Comhairle, Seán Ó Fearghaíl, did not announce his retirement, he was automatically returned, and the remaining 159 of the 160 seats were up for election.

A Constituency Commission, convened in July 2016 under the provisions of the Electoral Act 1997 with High Court judge Robert Haughton as chair, made recommendations on changes to constituency boundaries after publication of initial population data from the 2016 census. The commission had some discretion but was constitutionally bound to allow no more than a ratio of 30,000 people per elected member, and was required by law to recommend constituencies of three, four or five seats, and to avoid – as far as was practicable – breaching county boundaries. The Commission report, released on 27 June 2017, recommended an increase in the number of TDs from 158 to 160 elected in 39 constituencies. These changes were implemented by the Electoral (Amendment) (Dáil Constituencies) Act 2017. The election of the 33rd Dáil was therefore held using the new boundaries, for 160 seats.

The following members of the 32nd Dáil did not seek re-election.