Left-wing terrorism or far-left terrorism is terrorism motivated by left-wing or far-left ideologies, committed with the aim of overthrowing current capitalist systems and replacing them with communist or socialist societies.

Left-wing politics describes the range of political ideologies that support and seek to achieve social equality and egalitarianism, often in opposition to social hierarchy as a whole or certain social hierarchies.

Left-wing nationalism or leftist nationalism is a form of nationalism which is based upon national self-determination, popular sovereignty, and left-wing political positions such as social equality.

Left-wing populism, also called social populism, is a political ideology that combines left-wing politics with populist rhetoric and themes.