Street vendors sell towels and posters with the images of Jair Bolsonaro and Luiz Inácio Lula da Silva. Photo: Casa da Photo/Shutterstock
With 30 political parties registered in Brazil and 18 represented in Congress, making sense of the country's political landscape can quickly feel like sifting through a bowl of alphabet soup. What’s more, party names often do not denote what parties actually stand for, creating further confusion.
A recent statistical study called "Partisan GPS" tries to bring some order to the jumble. It ranks 28 parties registered with Brazil's Superior Electoral Court (TSE) on a left-right spectrum, using four variables: candidate migration between the 2020 and 2024 municipal elections, participation in congressional caucuses, voting records in the lower house, and coalition arrangements formed ahead of the 2024 electoral cycle.
The findings reveal clear poles and a crowded center. Novo sits the furthest to the right; the PSTU (Unified Socialist Workers' Party) anchors the far left; and the Brazilian Democratic Movement (MDB) party lands at the ideological midpoint, reflecting its long reputation for flexibility over fixed doctrine. Two parties fall outside the ranking — the far-left PCO and the newly created Missão — due to insufficient data or no electoral history yet.
Here are primers on the political parties with the five largest benches in Brazil's lower house:
Workers’ Party (PT)
The PT was founded in 1980, during Brazil's transition away from military rule, by union leaders, intellectuals, artists and social movements. Its founding ideology centered on democratic socialism and opposition to inequality and corruption. In 1989, the party's standard-bearer, Luiz Inácio Lula da Silva, reached the runoff in Brazil's first post-dictatorship presidential election.
The PT governed Brazil from 2003 to 2016. Lula left office in 2010 with high approval ratings, his tenure marked by the creation of broad and popular social programs such as Bolsa Família. His chosen successor, Dilma Rousseff, became Brazil's first woman president — before being impeached in 2016 amid a fiscal and political crisis.
Ideologically, the PT has drifted toward pragmatism over the decades, forging alliances with centrist and business-friendly sectors. It remains closely tied to labor unions and social movements, and Lula remains one of Brazil's most influential political figures — a dominance that has arguably limited the emergence of new national leaders within the party.
Liberal Party (PL)
The PL was founded in 1985, during Brazil's return to democracy, initially positioning itself as a reform-minded alternative to the political extremes. It merged with PRONA in 2006 to become the Party of the Republic (PR), before reverting to its original name in 2019.
The party's dominant figure is Valdemar Costa Neto, a former congressman from the outskirts of São Paulo who has been convicted of corruption. He remains the party's chairman and chief political operator.
The PL's national profile changed dramatically in 2021, when Jair Bolsonaro joined to dispute the 2022 presidential race — after failing to launch his own party. He brought a wave of allies with him, including his sons Flávio and Eduardo Bolsonaro.
The PL has evolved from an ideologically fluid party into a far-right force. When Lula won the 2022 election by a narrow margin, the PL filed legal challenges questioning the integrity of Brazil's electronic voting system — amplifying Bolsonaro's conspiracy theories.
Social Democratic Party (PSD)
The PSD was founded in 2011 by Gilberto Kassab, then mayor of São Paulo, Brazil’s wealthiest and most populous city. Kassab famously described the PSD as "neither right, nor left, nor center." In practice, the party almost always aligns with whoever holds federal power, trading congressional support for cabinet posts.
The PSD's regional branches operate with considerable independence, held together less by ideology than by their proximity to power. Its modus operandi, rooted in strategic ambiguity, transformed the PSD into an electoral juggernaut.
The PSD has more mayors (885 of Brazil’s 5,570) and state governors (6 of 27) than any other political party in Brazil. It also commands the second-largest bench in the Senate (14 of 81 seats), and a sturdy fifth place in the lower house (47 of 513). That prowess has elevated Kassab’s status from local politician to an éminence grise of national politics, thriving by never giving too much away.
União Brasil
União Brasil came to existence in 2022, the result of merging two parties: the Social Liberal Party (PSL) and Democratas (DEM). The PSL had been a minor party until Jair Bolsonaro's election in 2018 catapulted it to national prominence. DEM, meanwhile, traced its roots to 1985, when it was founded by supporters of the departing military regime.
The merger created the largest party in the lower house at the time, but União Brasil lost rank-and-file members when several politicians moved to the PL to follow Jair Bolsonaro and benefit from the bandwagon effect generated by his re-election campaign.
While both its founding parties were firmly right-wing, União Brasil is far from being ideologically consistent. It is part of Lula's left-leaning governing coalition and holds cabinet posts, though a portion of its congressional bloc still votes with the opposition.
Progressives (PP)
The PP traces its roots to Arena, the party that backed the military dictatorship. Over the decades, it has changed names multiple times and merged with other parties before settling on "Progressives" in 2018.
Despite the name, the party is conservative, close to the far right, and is a pillar of the so-called Big Center — a large congressional bloc that tends to back whoever holds federal power in exchange for the right incentives. As with most Big Center parties, the PP is not ideologically coherent: it was a key Bolsonaro ally, yet was part of Lula's coalition before announcing a split in 2025.
Internal cohesion has always been limited by the party's heterogeneous makeup — the product of successive mergers. It compensates with reach: the PP has one of the largest municipal networks in the country, with substantial lower-house bench and an enviable campaign kitty, making it a sought-after partner every electoral cycle.
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