Josef Bosácek (17 February 1857 – 5 September 1934 Príbram) was a Czech painter and classical graffiti artist.
He was a pupil of Gabriel Jakub Wüger, Professor of the Painting Academy in Rome.
In 1886, he enrolled at the Academy of Fine Arts in Prague and studied under Professor František Sequens, Antonín Lhota and Julius Marák.
During his studies, he met Mikoláš Aleš, with whom he collaborated on various frescoes and graffiti on facades in the 1890s.
In 1896, 1900, and 1903–1907, he worked for the builder Rudolf Štech in Plzen.
After his brother's (who was a priest) death in 1918, he became a hermit and painted frescoes related to Jesus Christ in a pilgrimage church at Maková hora near Príbram.