A constitutional referendum was held in Russia on 12 December 1993. The new constitution was approved by 58.4% of voters, and came into force on 25 December.
A constitutional referendum was held in France on 21 October 1945. Voters were asked whether they approved of the Assembly elected on the same day serving as a Constituent Assembly, and whether until a new constitution was approved, the country would be governed according to a proposed set of laws that appeared on the ballot paper. If the first proposal had not been approved, the Third Republic would have been restored, but its approval led to the elected Assembly drafting a constitution and proposing it to the people a year later, resulting in the creation of the Fourth Republic. Both were approved by wide margins with a turnout of 79.8%.
A constitutional referendum was held in France on 5 May 1946. Voters were asked whether they approved of a new draft Constitution proposed by the Constituent Assembly elected in 1945.
A constitutional referendum was held in France on 13 October 1946. Voters were asked whether they approved of a new constitution proposed by the Constituent Assembly elected in June. Unlike the May referendum, which saw a previous constitutional proposal rejected, the new Constitution of 27 October 1946 was accepted by 53% of voters, and brought the Fourth Republic into existence. Voter turnout was 68%.
A constitutional referendum was held in France on 28 September 1958. Voters were asked whether they approved of the adoption of a constitution for the French Fifth Republic written by Charles de Gaulle. It was overwhelmingly approved, with 82.6% in favour. Voter turnout was 84.9% in metropolitan France and 79.8% overall.
A constitutional referendum was held in France on 8 May 1870. Voters were asked whether they approved of the liberal reforms made to the constitution since 1860 and passed by the Sénatus-consulte on 20 April 1870. The changes were approved by 82.7% of voters with an 81.3% turnout. However, France's defeat in the Franco-Prussian War caused the Empire to be abolished later that year. Although this was the ninth constitutional referendum in French history, it was the first to have more than 8% oppose the motion; four of the previous seven had officially gained 99% approval.
A referendum was held in France on 20 and 21 December 1851. Voters were asked whether they approved of the continuation of the authority of Louis Napoléon Bonaparte and to delegate the powers required to produce a new constitution. It was approved by 92% of voters with an 81.7% turnout.
A constitutional and electoral age referendum was held in Denmark on 28 May 1953. Both proposals were approved by voters, leading to both a new constitution taking effect on 5 June, and the electoral age being lowered from 25 to 23 years, also starting on 5 June. Voter turnout was 59.1% for the constitution question and 57.1% for the voting age question.
A constitutional referendum was held in Denmark on 6 September 1920. It was held in order to make changes to the constitution of Denmark from 1915 that had been made necessary to facilitate the reunification of Southern Jutland into the kingdom of Denmark. The changes were approved by 96.9% of voters, with a 49.6% turnout. A total of 614,227 of the 1,291,745 registered voters voted in favour, meaning that 47.6% of eligible voters had voted for the proposals, above the 45% required by the constitution.
A constitutional referendum was held in Iceland between 20 and 23 May 1944. The 1 December 1918 Danish–Icelandic Act of Union declared Iceland to be a sovereign state separate from Denmark, but maintained the two countries in a personal union, with the king of Denmark also being the king of Iceland. In the two-part referendum, voters were asked whether the union with Denmark should be abolished, and whether to adopt a new republican constitution. Both measures were approved, each with more than 98% in favour. Voter turnout was 98% overall, and 100% in two constituencies, Seyðisfjörður and Vestur-Skaftafjellssýsla.
A double referendum was held in Poland on 18 February 1996. One question concerned enfranchisement, whilst the others concerned state property. The first proposition was ordered by the President, whilst the others were created on the basis of resolution made by Sejm. All except one were approved by over 90% of voters. However, voter turnout was just 32%, well below the 50% threshold required to make the results valid.
A constitutional referendum was held in Albania on 7 November 1994. Voters were asked whether they approved of the new constitution published on 6 October, which would have given more power to the country's president. However, it was rejected by voters, with just 43.6% in favour. Voter turnout was 84.4%.
A constitutional referendum was held in Albania on 22 November 1998. Voters were asked whether they approved of the constitution. It was approved by 93.5% of voters with a turnout of 50.6%, and came into force on 28 November.
A constitutional referendum was held in Andorra on 14 March 1993. Drafted by the Co-Princes and the General Council, the new constitution was approved by 74.2% of voters, with a 76% turnout. The first elections under the new constitution were held later in the year.
A constitutional referendum was held in Bulgaria on 16 May 1971. Voters were asked whether they approved of a new constitution. The new constitution defined Bulgaria as a "socialist state of the working people from the cities and the villages", led by the Bulgarian Communist Party in cooperation with the Bulgarian Agrarian National Union. The result was reportedly 99.7% in favour, with a voter turnout of 99.7%.
A referendum on a new constitution and citizenship was held in Estonia on 28 June 1992. Voters were asked whether they approved of the new constitution drawn up by the Constitutional Assembly and extending suffrage to people who had applied for citizenship by 5 June. The new constitution was approved by 92% of voters, whilst the suffrage extension was rejected by 53%. Voter turnout was 67%.
A constitutional referendum was held in East Germany on 6 April 1968. The new constitution was approved by 96.4% of voters, with turnout reported to be 98.1%, and came into force on 9 April.
A constitutional referendum was held in Lithuania on 10 November 1996 alongside the second round of the parliamentary elections. Voters were asked whether they approved of an amendment to Article 47 of the constitution to add a paragraph allowing EU citizens to buy agricultural land. Although it was approved by 52% of those voting, voter turnout was only 39.7% and the referendum failed to pass the threshold of 50% of registered voters in favour.
A four-part referendum was held in Lithuania on 20 October 1996 alongside the first round of parliamentary elections. Voters were asked whether they approved of three amendments to the constitution and whether money from the sale of state property should be used to compensate those who lost their Soviet-era savings due to inflation. The three constitutional amendments would reduce the number of members of the Seimas, fix the date for elections to be in the spring, and to reserve at least 50% of government expenditure to social spending.
Three referendums were held in Switzerland during 1919. The first two were held on 4 May on amending the constitution to add article 24ter on shipping, and on a constitutional amendment to impose a war tax. Both proposals were approved by a majority of voters and cantons. The third was held on 10 August on temporary amendments to article 73 of the constitution, and was also approved in spite of low turnout.
