Astro-Brazilian philosophy, or Brazilian Astronism, refers to the presence of Astronism in the Federative Republic of Brazil under management and philosophical jurisdiction of The Institution of the Philosophy of Millettism for the Federative Republic of Brazil, a national subsidiary for the worldwide Astronist Institution. 

The Institution of the Philosophy of Millettism for the Federative Republic of Brazil oversees the construction and maintenance of observatories and planetariums throughout its jurisdiction. Brazil is split into twenty-six states and is set to hold three Grand Observatories in the capital city of Brasília as well as in the largest cities of Rio de Janeiro and São Paulo. 

History of Astronism in Brazil

Astronism is currently not recognised by the Brazilian government as an official religious group in the country, however, religious liberties are generally practiced for all citizens meaning Astronists are free to publicly profess and practice their faith. As of November 2019, only small amounts of Astronist content have accurately translated into Spanish meaning that most Brazilians cannot access the full array of Astronist content which causes a major barrier for Brazilian Astronists. Due to Astronism's unrecognised status in the country, the number of Brazilian Astronists is unknown, however, estimates by the Institution have been projected at around 9,000 people.