Local elections were held in Liechtenstein in 1991 to elect the municipal councils and the mayors of the eleven municipalities.

The municipal councils (German: Gemeinderat) are composed of an even number of councillors plus the mayor (German: Gemeindevorsteher).

Councillors were elected in single multi-member districts, consisting of the municipality's territory, using an open list proportional representation system.

Voting was on the basis of universal suffrage in a secret ballot.

If none of the candidates achieved a majority in the first round, a second round would have been held four weeks later, where the candidate with a plurality would be elected as a mayor.