Leitrim–Sligo was a parliamentary constituency represented in Dáil Éireann, the lower house of the Irish parliament or Oireachtas from 1923 to 1937.
The constituency elected 7 deputies (Teachtaí Dála, commonly known as TDs) to the Dáil, on the system of proportional representation by means of the single transferable vote (PR-STV).
The vote was delayed two weeks in Leitrim–Sligo due to the assassination of Patrick Reynolds TD two days before the election was to take place.
Following the death of Fianna Fáil TD Samuel Holt on 18 April 1929, a by-election was held on 7 June 1929.
Following the resignations of Cumann na nGaedheal TDs Thomas Carter and Alexander McCabe on 30 October 1924, a by-election for both seats was held on 11 March 1925.