Bronisław Ferdynand Trentowski (21 January 1808 in Opole – 16 June 1869) was a Polish "Messianist" philosopher, pedagogist, journalist and Freemason, and the chief representative of the Polish Messianist "national philosophy."
Bronisław Trentowski was an alumnus of the Piarist college in Łuków. In his youth, he taught school in Podlasie, then fought as an ulan in the Polish November 1830–31 Uprising. After the uprising's suppression, he emigrated to Germany, eventually settling at Freiburg in Baden. He developed an interest in philosophy, became an assistant professor at Freiburg University and remained there to the end of his life. He attempted to return to Poland, but was expelled from Poznań in 1843 by the Prussian government, and from Kraków in 1848 by the Austrian government.
He published his first work in 1837 in German, but from 1842 he wrote only in Polish, beginning with Chowanna, czyli system pedagogiki narodowej jako umiejętności wychowania, nauki i oświaty, słowem wykształcenia naszej młodzieży (Chowanna, or the System of National Pedagogy as the Science of Education and Instruction, in a Word, of Educating Our Youth).
Trentowski, in his book Stosunek filozofii do cybernetyki, czyli sztuki rządzenia narodem (The Relation of Philosophy to Cybernetics, or the Art of Governing a Nation, 1843), was the first Polish-language author to use the term "cybernetics."
In 1847–48 he wrote a book, Wiara słowiańska, czyli etyka piastująca wszechświat (The Slavic Faith, or the Ethics that Governs the Universe), demonstrating that the Slavic gods were a form of the same god that was worshipped by Christians.