Polymorphia is a composition for 48 string instruments composed by the Polish composer Krzysztof Penderecki in 1961. The piece was commissioned by the North German Radio Hamburg. It premiered on 16 April 1962 by the radio orchestra and was conducted by Andrzej Markowski. Polymorphia is dedicated to Hermann Moeck, the first of Penderecki’s editors in the West.

Krzysztof Eugeniusz Penderecki was a Polish composer and conductor. His best-known works include Threnody to the Victims of Hiroshima, Symphony No. 3, his St Luke Passion, Polish Requiem, Anaklasis and Utrenja. His oeuvre includes four operas, eight symphonies and other orchestral pieces, a variety of instrumental concertos, choral settings of mainly religious texts, as well as chamber and instrumental works.