The Philharmonia Orchestra is a British orchestra based in London. It was founded in 1945 by Walter Legge, a classical music record producer for EMI. Among the conductors who worked with the orchestra in its early years were Richard Strauss, Wilhelm Furtwängler and Arturo Toscanini; of the Philharmonia's younger conductors, the most important to its development was Herbert von Karajan who, though never formally chief conductor, was closely associated with the orchestra in the late 1940s and early 1950s. The Philharmonia became widely regarded as the finest of London's five symphony orchestras in its first two decades.

Harry Walter Legge was an English classical music record producer, most especially associated with EMI. His recordings include many sets later regarded as classics and reissued by EMI as "Great Recordings of the Century". He worked in the recording industry from 1927, combining this with the post of junior music critic of The Manchester Guardian. He was assistant to Sir Thomas Beecham at the Royal Opera House, Covent Garden, and in World War II played a role in bringing music to the armed forces and civilians.