Guilherme Castro Boulos (; born 19 June 1982) is a Brazilian politician, activist and writer who has served as Secretary-General of the Presidency since 2025. He is a member of the National Coordination of Homeless Workers' Movement (MTST). Boulos joined the Socialism and Liberty Party (PSOL) in 2018, and was PSOL's candidate for the presidency of Brazil in the 2018 general election.
In 2020, Boulos was the PSOL nominee for mayor of São Paulo in the 2020 election, qualifying for a second round against PSDB candidate Bruno Covas. Covas defeated Boulos in the run-off. In the 2022 Brazilian general election, Boulos was elected to the Chamber of Deputies from São Paulo, having received the most votes for federal deputy in the state.
As a member of the Homeless Workers' Movement, Boulos became nationally known in 2003, when he participated in an occupation of Volkswagen's land in São Bernardo do Campo. Closely associated with President Lula da Silva, he has been described as an "heir" to Lula, with his physical likeliness to Lula during his youth being widely noted. He was selected by Time for their Time 100 Next list of emerging leaders worldwide for 2021.
Early life and career Boulos is the son of Marcos Boulos, a professor of medicine at the University of São Paulo. He is of Lebanese Christian descent, with “Boulos” meaning “Paul” in Arabic. He graduated with a degree in philosophy in 2006 and received a master's degree in mental health in 2017, both from the University of São Paulo. In his youth he engaged in the Union of Communist Youth. He also joined the Homeless Workers' Movement in 2002.
Boulos became famous in 2003 when he participated in the coordination of the invasion of a Volkswagen's ground in São Bernardo do Campo. He appeared again in the press in 2014, in the wake of the social mobilizations around the World Cup, especially the squat called Occupation People's Cup (), organized by the MTST in early May.
On 17 January 2017, Boulos was arrested on charges of committing judicial disobedience and incitement to violence during the repossession lawsuit of a plot of land in the district of São Mateus. Later that evening, he was released from prison. In his defense, he claims that his detention was arbitrary and for political reasons.Líder do MTST é solto após ser detido em reintegração de posse em São Paulo
Books
Electoral history YearElectionPartyOfficeCoalitionPartnersPartyVotesPercentResult 2018 Presidential election President Let's Go With No Fear of Changing Brazil(PSOL, PCB) Sônia Guajajara 617,122 0.58% 2020 Municipal election of São Paulo Mayor To Turn the Tide(PSOL, PCB, UP) Luiza Erundina 1,080,736 20.24% 2,168,109 40.62% 2022 State elections of São Paulo Federal Deputy colspan=4 1,001,472 4.22% 2024 Municipal election of São Paulo Mayor Love for São Paulo(PSOL, REDE, PT, PCdoB, PV, PDT, PMB, PCB) Marta Suplicy 1,776,127 29.08% 2,323,901 40.65%
See also 2018 Guilherme Boulos presidential campaign
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