An election to all 18 seats on Roscommon County Council was held on 24 May 2019 as part of the 2019 Irish local elections. County Roscommon was divided into 3 local electoral areas (LEAs) to elect councillors for a five-year term of office on the electoral system of proportional representation by means of the single transferable vote (PR-STV). Only three political parties (Fine Gael, Fianna Fáil and Sinn Féin) fielded candidates in County Roscommon, the fewest of any local government area in the 2019 local elections.
Following the recommendations of the 2018 LEA boundary review committee, no changes were made to the LEAs used at the 2014 Roscommon County Council election.