The Workers' Party of Belgium is a Marxist and socialist political party in Belgium. It is the only Belgian party represented in parliament that is a fully national party, representing both Flanders and Wallonia. Having historically been a small party, the PTB-PVDA has gained momentum since the 2010s, continuously scoring better at the elections, particularly in Wallonia and working-class communities in Brussels.

Maoism, also known as Mao Zedong Thought, is a variety of Marxism–Leninism that Mao Zedong developed while trying to realize a socialist revolution in the agricultural, pre-industrial society of the Republic of China and later the People's Republic of China. A difference between Maoism and traditional Marxism–Leninism is that a united front of progressive forces in class society would lead the revolutionary vanguard in pre-industrial societies rather than communist revolutionaries alone. This theory, in which revolutionary praxis is primary and ideological orthodoxy is secondary, represents urban Marxism–Leninism adapted to pre-industrial China. Later theoreticians expanded on the idea that Mao had adapted Marxism–Leninism to Chinese conditions, arguing that he had in fact updated it fundamentally and that Maoism could be applied universally throughout the world. This ideology is often referred to as Marxism–Leninism–Maoism to distinguish it from the original ideas of Mao.