Peter Lagger (7 September 1926 – 17 September 1979) was a Swiss bass in opera and concert. He was a member of European opera houses, finally the Deutsche Oper Berlin, and appeared as a guest internationally. He took part in world premieres such as Louise Talma's Die Alkestiade at the Oper Frankfurt, and Henze's Die Bassariden and Penderecki's Magnificat, both at the Salzburg Festival.