- Antonio Billi, author of a manuscript kept at the "National Central Library" (Florence), entitled "Libro di Antonio Billi" is not said to have been written by him, but it was certainly in his possession. Giorgio Vasari consulted it, noting various errors and inaccuracies.
- Riccardo Billi (producer), Italian film producer and distributor, he only acted in the movie "Way of the Dragon" with his wife, the actress, Malisa Longo.
- Riccardo Billi (actor), was an Italian actor (1906-1982), with Mario Riva he appeared as comic duos "Billi & Riva".