The Red–Green Alliance or Unity List is an eco-socialist political party in Denmark. It was founded in 1989 with the merger of three Marxist parties and it is the most left-wing party in the Parliament of Denmark, where it advocates for the expansion of the welfare state and social justice as well as the socialist transformation of Denmark and the entire globe. During the 2021 Copenhagen City Council election the party placed first, with 24.6% of the votes. The party is also active in various trade unions within Denmark.

Eco-socialism is an ideology merging aspects of socialism with that of green politics, ecology and alter-globalization or anti-globalization. Eco-socialists generally believe that the expansion of the capitalist system is the cause of social exclusion, poverty, war and environmental degradation through globalization and imperialism, under the supervision of repressive states and transnational structures.