Kazimierz Franciszek Vetulani (3 January 1889 – 4 July 1941) was a Polish civil engineer, professor at the Lviv Polytechnic, member of the Polish Mathematical Society, author of several dozen papers in the fields of technology and mathematics, as well as in the field of musical scale theory. Shortly after the Germans seized Lviv during World War II, on the night of 4 July 1941, he was arrested by Gestapo, the German secret police, and murdered among a group of Lviv professors.