Fra Antun Knežević (9 January 1834 – 22 September 1889) was a Bosnian Franciscan friar, historian and writer from Varcar Vakuf [Now Mrkonjić Grad], Bosnia and Herzegovina.

Fra Antun Knežević studied in Fojnica, Rome, and Siena and became friar on 26 April 1851.

His position and doctrine was that all Bosnians are one people of three faiths and that up to the late 19th century, no Croats and Serbs lived in Bosnia and Herzegovina.

[4][5][6] But it was these two, Fra Knežević and his mentor, Fra Jukič, who left the deepest mark on Bosnian culture and history, while championing the notion that Catholics, Orthodox and Muslims are one nation, and Bosnia and Herzegovina a country with deep cultural and historical roots.

[7][8][9] Like Jukić before him, Knežević too articulately expressed his feeling of national belonging, which he always and primarily defined as Bosnian in such a way as to include all three religious groups inhabiting Bosnia and Herzegovina.