An election to all 26 seats on South Tipperary County Council took place on 27 June 1991 as part of the 1991 Irish local elections.

South Tipperary was divided into five 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).

This term was extended twice, first to 1998, then to 1999.

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