The Portland Chamber Orchestra is an orchestra based in Portland, Oregon. Founded in 1947 by Boris Sirpo, its first performance was on May 27, 1947 at the Neighbors of Woodcraft Auditorium. Its home venue is Kaul Auditorium at Reed College.
Boris Sirpo, the founding music director, was an energetic and exceedingly demanding conductor. The first concert performed in 1947 was a tour de force of performance which included Gluck's Overture to Orpheus, Corelli's Concerto Grosso, John Humphries's Concerto for Strings, Carl Stamitz's Orchestra Quartet, Paul Hindemith's Three Pieces for Strings, Jean Sibelius's Romance in C, A. Arensky's Variations on a Theme by Tschaikowsky, and Bach's Concerto in A Minor based on a Theme by Vivaldi.