Pēteris Vasks (born 16 April 1946) is a Latvian composer.
Vasks was born in Aizpute, Latvia, into the family of a Baptist pastor. He trained as a violinist at the Jazeps Vitols Latvian Academy of Music, as a double-bass player with Vitautas Sereikaan at the Lithuanian Academy of Music and Theatre, and played in several Latvian orchestras before entering the State Conservatory in Vilnius in the neighboring Lithuania to study composition with Valentin Utkin, as he was prevented from doing this in Latvia due to Soviet repressive policy toward Baptists. He started to become known outside Latvia in the 1990s, when Gidon Kremer started championing his works and now is one of the most influential and praised European contemporary composers.
Vasks' early style owed much to the aleatoric experiments of Witold Lutosławski, Krzysztof Penderecki and George Crumb. Later works included elements of Latvian folk music, such as his gentle and pastoral cor anglais concerto (1989). His works are generally extremely clear and communicative, with a solid and muscular sense of harmony. Lyrical passages may be followed by agitated dissonances, or interrupted by sombre sections with a march-like feel. He made extensive use of minimalist techniques as well, but never became a slave to any particular method.