Ivan Ivanovich Petrov (Russian: Иван Иванович Петров; b. February 29, 1920 in Irkutsk ― d. December 26, 2003 in Moscow) was a Russian bass opera singer. Born Ivan Krauze (Краузе), the family took the name Petrov in 1936 after moving from Siberia to Moscow due to the suspicions of anyone with a German surname. He entered the Bolshoi Theatre in 1942 after three years with the Moscow Philharmonic spent traveling giving concerts for the troops. He continued singing until 1970 when diabetes began to affect his voice, then concentrated on teaching.