1991 Mayo County Council election

An election to Mayo County Council took place on 27 June 1991 as part of that year's Irish local elections. 31 councillors were elected from seven local electoral areas (LEAs) for a five-year term of office on the electoral system of proportional representation by means of the single transferable vote (PR-STV). This term was extended twice, first to 1998, then to 1999.