Kenneth Lorin Darby (May 13, 1909 – January 24, 1992) was an American composer, vocal arranger, lyricist, and conductor. His film scores were recognized by the awarding of three Academy Awards and one Grammy Award. He provided vocals for the Munchkinland mayor in The Wizard of Oz (1939), who was portrayed in the film by Charlie Becker. Darby is also notable as the author of The Brownstone House of Nero Wolfe (1983), a biography of the home of Rex Stout's fictional detective.

Ken Darby's choral group, The Ken Darby Singers, sang backup for Bing Crosby on the original 1942 Decca Records studio recording of "White Christmas." In 1940 they also sang on the first album ever made of the songs from The Wizard of Oz, a film on which Darby had worked. However, the album was a studio cast recording, not a true soundtrack album (although it did feature Judy Garland), and it did not use the film's original arrangements.