Charles Maximilian Siem[1] (born 14 January 1986) is an English contemporary classical violinist.

[6] Siem began the study of violin at age three when his interest was piqued upon hearing the cassettes his mother used to play for her children.

Siem is distantly related to Norwegian violin virtuoso and composer Ole Bull.

[8][better source needed] He plays a violin made by Guarneri del Gesu from 1735, also known as "The d'Egville".

[7] He is married to Countess Viola Arrivabene Valenti Gonzaga, first daughter of Count Giberto Arrivabene Valenti Gonzaga and Princess Bianca of Savoy-Aosta (daughter of Princess Claude of Orléans and Duke Amedeo of Aosta).