Sergei Leiferkus (born 4 April 1946) is an operatic baritone from Russia, known for his dramatic technique and powerful voice particularly in Russian and Italian language repertoire. He is most notable for his roles as Scarpia in Tosca, Iago in Otello, Grand-prétre de Dagon in Samson et Dalila and Simon Boccanegra as the title role. Leiferkus was born in Leningrad (now known as St Petersburg), Russia. He studied music at the St. Petersburg conservatory.