Rudolf Rudolfovich Frentz (Russian: ????´??? ????´??????? ???´??; 23 July 1888 – 27 December 1956) was a Soviet and Russian painter, watercolorist, graphic artist, illustrator and art teacher who lived and worked in Leningrad.
He was a member of the Leningrad Union of Artists and one of the founders of the Leningrad school of painting, most famous for his battle and monumental painting.