The main opposition subject in the eleventh assembly of Parliament of Montenegro are the Democratic Party of Socialists (DPS) of Milo Đukanović, which fall from the power, after ruled the country for 30 years, since the introduction of multi-party system in 1990. The August 2020 parliamentary election resulted in the victory of the lists of parties which were in opposition in the previous parliament convocation; For the Future of Montenegro (DF-SNP-NP), Peace is Our Nation (DCG-Demos), United Reform Action (URA) and the Social Democratic Party (SDP), opposition lists won 43 of the 81 seats in the Parliament of Montenegro, while the ruling DPS, together with the Liberal Party, won only 30 seats, going into opposition after thirty years in power. Three opposition lists For the Future of Montenegro, Peace is Our Nation and United Reform Action, which won a majority of 41 MPs, announced the formation of a coalition government, while the SDP remained in opposition. In the 11th assembly of the Parliament (2020–present), the subjects in parliament that include the opposition are:^[1][2]

Since the constitution the 10th assembly of the Montenegrin Parliament the entire opposition (all 39 MPs out of 81 in total) started a collective boycott of all parliamentary sittings, due to claims of electoral fraud at the October 2016 parliamentary elections. The largest opposition group, Democratic Front alliance, decides to end the boycott and return to parliament in December 2017, as did newly formed, United Montenegro.^[3] The Social Democratic Party and the Demos both decides to end the boycott and return to parliament, after poor results in May 2018 local elections, as did Socialist People's Party. Leaving Democratic Montenegro and United Reform Action, who remaining in a boycott with the same demands. In the 10th assembly of the Parliament of Montenegro (2016–2020), the subjects in parliament that include the opposition are:^[4]

Since the constitution of the 9th assembly of the Montenegrin Parliament, the opposition subjects in the parliament were Democratic Front (DF), Socialist People's Party (SNP) and Positive Montenegro (PCG). The leader of the opposition was Miodrag Lekić, leader of the DF. After Lekić's abandonment of Democratic Front in March 2015, Andrija Mandić became de facto leader of opposition. In January 2016, despite formerly being an opposition party, PCG provided the ruling DPS with 3 votes necessary to win the government confidence vote, after the DPS's coalition partner the SDP left the government coalition due to allegations of electoral fraud and political corruption, leaving the government functioning as a de facto minority government. Provisional government was elected on May 12, 2016, by the Parliament. The provisional governing coalition was formed by ruling DPS and several opposition parties.^[5] The subjects in the Parliament that include the opposition were:^[6][7]

• Political opposition
• Politics of Montenegro