One-party system Parliamentary majority or minority government Coalition partner or supporter • (2005–2009, 2013–2014, 2021–2022) –
Communist Party of Bulgaria, in coalition government as member of the
Coalition for Bulgaria • (1946–1947) –
Communist Party of Belgium, in the
Van Acker I Government • (1944–1948, 1966–1970, 1970–1971, 1975–1976 and 1977–1982) –
Finnish People's Democratic League, in coalition governments with numerous other parties • (1981–1989; 1997–2002) –
French Communist Party as a part of the
Union de la gauche and of the
Gauche plurielle • (2004–2008) –
Communist Party of India (Marxist) and
Communist Party of India, in the coalition government of the
United Progressive Alliance • (1946) –
Tudeh Party of Iran, in the
coalition government of Ahmad Qavam • (1998–2001, 2006–2008) –
Party of Italian Communists in the
D'Alema I Cabinet,
D'Alema II Cabinet,
Amato II Cabinet with
The Olive Tree;
Communist Refoundation Party and Party of Italian Communists in the coalition government of
The Union • (2005–2014) –
Malian Party of Labour, participated in the
Alliance for Democracy in Mali • (1945) –
Communist Party of Norway in coalition government as member of
Gerhardsen's First Cabinet led by the
Labour Party • (2011–2016) –
Peruvian Communist Party, in coalition governments as member of
Peru Wins • (2015–2019) –
Portuguese Communist Party in support of the
XXI Constitutional Government of Portugal led by the
Socialist Party • (1945–1957, 1978–1992) –
Sammarinese Communist Party, in coalition government with
Sammarinese Socialist Party • (1970–1975, 1994–2000, 2004–2015 and 2020–2022) –
Communist Party of Sri Lanka and
Lanka Sama Samaja Party, in coalition governments with numerous other parties • (2005–2020) –
Communist Party of Uruguay and
People's Victory Party, in coalition governments as members of the
Broad Front == Modern non-ruling ==