The Democratic Party of Socialists of Montenegro is a social-democratic and populist political party in Montenegro. A former long-time ruling party sitting at the opposition for the first time as of 2020, it was formed on 22 June 1991 as the successor of the League of Communists of Montenegro, which had governed Montenegro within the Socialist Federal Republic of Yugoslavia since World War II, and has remained a major force in the country ever since. The party is a member of the Socialist International and the Progressive Alliance, and an associate of the Party of European Socialists. During the 1990s, DPS was the major centre-left, social-democratic party in favour of Serbian–Montenegrin unionism. However, since 1997, the party has embraced Montenegrin independence and has been improving ties with the West, slowly turning into a catch-all party embracing Atlanticism, Montenegrin nationalism, neoliberalism, and pro-Europeanism.

An independence referendum was held in Montenegro on 21 May 2006. It was approved by 55.5% of voters, narrowly passing the 55% threshold. By 23 May preliminary referendum results were recognized by all five permanent members of the United Nations Security Council, suggesting widespread international recognition if Montenegro were to become formally independent. On 31 May the referendum commission officially confirmed the results of the referendum, verifying that 55.5% of the population of Montenegrin voters had voted in favor of independence. Because voters met the controversial threshold requirement of 55% approval, the referendum was incorporated into a declaration of independence during a special parliamentary session on 31 May. The Assembly of the Republic of Montenegro made a formal Declaration of Independence on Saturday 3 June.