Left-wing populism, also called social populism, is a political ideology that combines left-wing politics with populist rhetoric and themes. Its rhetoric often includes elements of anti-elitism, opposition to the Establishment, and speaking for the common people. Recurring themes for left-wing populists include economic democracy, social justice, and skepticism of globalization. Socialist theory plays a lesser role than in traditional left-wing ideologies.

Criticism of capitalism and globalization is linked to unpopular United States military operations, especially those in the Middle East. It is considered that the populist left does not exclude others horizontally and relies on egalitarian ideals. Some scholars also speak of nationalist left-wing populist movements, a feature exhibited by the Sandinista Revolution in Nicaragua or the Bolivarian Revolution in Venezuela. Unlike right-wing populism, left-wing populist parties tend to be supportive of minority rights, as well as to an idea of nationality that is not delimited by cultural or ethnic particularisms. Bernie Sanders and Alexandria Ocasio-Cortez, self-described democratic socialists, are examples of modern left-wing populist politicians in the United States. With the rise of Syriza and Podemos during the European debt crisis, there has been increased debate on new left-wing populism in Europe.

Traditionally, left-wing populism has been associated with the socialist movement; since the 2010s, there has been a movement close to left-wing populism in the left-liberal camp, some of which are considered social democratic positions. In the 2020s, left-liberal economic populism appealing to the working class has been prominent in some countries, such as with Joe Biden of the United States and Lee Jae-myung of South Korea, where liberal and conservative parties are the main two parties.

Peter Obi, a businessman and outsider politician running with the Labour Party in the 2023 Nigerian presidential election, was seen as a populist politician, gaining the support of much of Nigeria's youth. Before running for President, Obi took part in the End SARS movement, which sought to disband Nigeria's Special Anti-Robbery Squad, or SARS due to its connection to the criminal underworld and its excessive use of force. SARS was disbanded in 2020. Obi's presidential campaign in 2022 and 2023 constantly ran on issues such as economic development, fighting corruption, moving beyond ethnic politics, which have dominated Nigeria going back to its founding, and promoting criminal justice reform. Obi sought to challenge the traditional two-party system, led by the centrist and Buharist All Progressives Congress on one side, and the center-right, nationalist, and conservative-liberal Peoples Democratic Party.

Julius Malema, the former leader of the African National Congress Youth League, broke away from the center-left African National Congress to form the Economic Freedom Fighters. The EFF are notable for their extreme black nationalism, which has been accused by critics of including anti-Asian racism, anti-White racism, and antisemitism. This also includes radical economic reforms inspired by Marxism-Leninism, including land reform without compensation. The EFF is also extremely anti-West, to the point of actively trying to support Russia's invasion and occupation in Ukraine and has denied the well documented war crimes committed by Russia, as well as the Belt and road initiative within Africa itself. However, the EFF is not socially conservative. In fact, voters for the EFF are the mostly likely of all voters in South Africa to support same-sex marriage, which has been legal since 2006.

In the run-up to the 2024 South African general election, former president Jacob Zuma has formed his own political party, uMkhonto we Sizwe. Named after the former paramilitary wing of the ANC of the same name, Zuma has been trying to position himself as supporting a more legitimate version of the ANC. MK, as Zuma's party is also known, calls for deporting illegal immigrants to South Africa, land reform without compensation, and opposition to same-sex marriage. The ladder making it in opposition to its South African Sibling on that one particular issue

Former dictator Robert Mugabe and his ZANU–PF party are seen as populist by many observers. Mugabe's ideology combined African nationalism with socialist economics and a broad-based appeal to the people. The most notably policies of ZANU–PF are their land reforms.

Cristina Fernández de Kirchner (the President of Argentina from 2007 to 2015) and her husband Néstor Kirchner were said to practice Kirchnerism, a variant of Peronism that was often mentioned alongside other Pink tide governments in Latin America. During Cristina Fernández de Kirchner's time in office, she spoke against certain free trade agreements, such as the proposed Free Trade Area of the Americas. Her administration was characterized by tax increases, especially on agricultural exports during the late 2000s commodities boom, Argentina's main export, in order to fund social programs such as the PROGRESAR university scholarships, the universal allocation per child subsidy (commonly referred to as AUH in Argentina, Asignación Universal por Hijo), a means-tested benefit to families with children who qualified for the subsidy, and progressive social reforms such as the recognition of same-sex marriage.