Olga Peretyatko (Russian: Ольга Перетятько; Leningrad, now Saint Peterburg, 21 May 1980) is a Russian operatic soprano. As a child Peretyatko sang in the children's choir of the Mariinsky Theater. As a student of the Hamburg Opera Studio she received the second prize at Operalia Competition (2007), an event sponsored by tenor Plácido Domingo.
Her large repertory includes operas from Händel and Mozart to Wagner and Strauss. A participant at the Accademia Rossiniana in Pesaro, she has regularly sung at the Rossini Opera Festival: Corinna and Contessa di Folleville (Il viaggio a Reims, 2006), Desdemona (Otello, 2007), Giulia (La scala di seta, 2009), Aldamira (Sigismondo, 2010), and the title role in Matilde di Shabran (2012). In 2013 she sings during the Mozartwoche in Salzburg.
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She is married to the conductor Michele Mariotti, who led the Matilde di Shabran performances in Pesaro.