Left communism, also known as left-wing communism, is an ultra-left political position. Left communism is a form of communist thought and action that forms from the concrete theory and practice of revolutionary communist organizing. It is thought to be related to petit-bourgeois revolutionism which "smacks of, or borrows something from, anarchism."

Left communists have historically rejected struggle in reactionary trade unions and bourgeois parliamentary institutions and/or elections. This is because left communists think engaging or making compromises with these institutions would be counter-revolutionary. This conflicts with the concrete struggle that the Bolsheviks waged in these institutions to effectively organize and raise class consciousness.

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