Roscommon–Galway is a parliamentary constituency that has been represented in Dáil Éireann, the lower house of the Irish parliament or Oireachtas, from the 2016 general election.

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

[1] The Constituency Review Report 2023 of the Electoral Commission recommended that at the next general election, the boundary of Roscommon–Galway be altered with the transfer of territory from Sligo–Leitrim and the transfer of territory to Galway East.

[2] The Electoral (Amendment) Act 2023 defines the constituency as:[3] Transfer from Galway East of: Transfer to Sligo–Leitrim of: Note: The columns in this table are used only for presentational purposes, and no significance should be attached to the order of columns.

For details of the order in which seats were won at each election, see the detailed results of that election.