Inactive or defunct The Organization of Marxists (Ukrainian: Організація марксистів, romanized: Orhanizatsiya marksystiv; OM) was a radical left-wing political association in Ukraine.

[1] One hundred and fifty people attended the founding conference, including about ninety delegates from left-wing publications, political groups, and trade union organizations from many cities in Ukraine.

The organization participated in campaigns against the adoption of the new labour code and amendments to the Law of Ukraine "On Higher Education", as well as against the increase in tariffs and attacks on the social rights of workers in the context of the economic crisis.

In 2009 and 2010, she participated in alternative May Day demonstrations in Kyiv together with a number of other left-wing organizations (“Social Alternative”, “Anti-Fascist Action”, the Revolutionary Confederation of Anarcho-Syndicalists, “New Left”, “Youth Against Capitalism”, Komsomol members expelled from the LKSMU, animal rights activists) and independent trade unions (Direct Action, Labor Defence).

Activists of the Organization of Marxists were at KhMZ from the very beginning of the events and actively contributed to the development of the action, and as a result, they tried to create a Coordinating Committee of struggling labor collectives.

Part of its activists (considered as the “Stalinist wing” of the OM and including people from the structures of the Communist Party and the Komsomol) took part in the creation of the Borotba association, the other (anti-Stalinist, mainly Trotskyist) - of the Left Opposition socialist association,[10] which after Maidan participates in the creation of a new leftist party Social Movement (originally the "Assembly of the Social Revolution"), the labor movement in Kryvyi Rih and Kyiv.