Frederick Flaxington Harker (1876–1936) was an American organist and composer of sacred music. He was born in Scotland. He became the assistant organist to T. Tertius Noble at York Minster. He emigrated to the United States at 25, and served as Organist and Choirmaster of All Souls Episcopal Church in Asheville, North Carolina. He moved to New York city in 1904, but returned to All Souls in 1907. Beginning in 1914, Harker served as Organist and Choirmaster at St. Paul's Episcopal Church in Richmond, Virginia.