Two referendums were held in San Marino on 2 June 2019. One was a popular initiative on amending the electoral system to require a second round to be held thirty days after a general elections between the top two parties only if neither are able to form a coalition government. The other was on a constitutional amendment proposed by the captain regent that would add sexual orientation to the list of discriminations prohibited by law. This followed a vote by the Grand and General Council on the amendment failing to meet the two-thirds quorum.
Both proposals were approved by voters.