Frederick Flaxington Harker was an American organist and composer. He was born in Scotland and emigrated to the United States at 25 to serve as Organist and Choirmaster of All Souls Episcopal Church in Asheville, North Carolina. Harker composed cantatas, anthems, choruses, songs both sacred and secular, and some works for organ. Harker was active as a music editor for G. Schirmer Inc. He edited many choral works, organ pieces, and John Stainer's classic text for organ students, The Organ.