Peeter Cornet (Pierre, Pietro, Peter, Pieter) was a Flemish composer and organist of the early Baroque period. Although few of his compositions survive, he is widely considered one of the best keyboard composers of the early 17th century.
Cornet's surviving output is small and consists only of keyboard music: eight fantasias, two courantes (with variations), a toccata, a setting of Salve Regina, and one of Tantum Ergo. One of the fantasias, Fantasia del 5. tuono sopra ut re mi fa sol la, survives incomplete. The style varies from animated, bright music of the courantes, to elaborate polyphony in the fantasias and the mystical, religious feeling of the Salve Regina setting.