Rudolf Gerlach-Rusnak (Ukrainian: Рудольф Герлах-Руснак; né Orest Rusnak [Орест Руснак]; later known as Gerlach; 24 July 1895 – 23 January 1960) was a German operatic and concert lyrical tenor, and a member of the Bavarian State Opera who had an international career and was known for his exceptional high register.