Problemas (Portuguese: Problems) was a monthly political magazine published in Rio de Janeiro, Brazil. It was subtitled Revista Mensal de Cultura Política. The magazine was first published in August 1947. It was the official media outlet of the Brazilian Communist Party and was published by its central committee. Diogenes Arruda who was a member of the Communist Party's national secretary was the editor of the magazine. It included only translations of the articles from communist magazines without covering the events in Brazil. The magazine ceased publication in 1957.
- John W. F. Dulles (1991). Carlos Lacerda, Brazilian Crusader: The years 1914-1960. Austin, TX: University of Texas Press. p. 449. ISBN 978-0-292-71125-9.
- "Periodicals Archive". Marxists. Retrieved 18 February 2017.
- Jose Mindlin; Cristina Antunes (2006). "Brasiliana: Published works and collections". In Carmen Nava; Ludwig Lauerhass Jr. (eds.). Brazil in the Making: Facets of National Identity. Lanham, MD: Rowman & Littlefield Publishers. p. 88. ISBN 978-0-7425-7201-0.
- Robert J. Alexander (1955). "Brazil's CP: A Case Study in Latin-American Communism". Problems of Communism. 4: 21.