Sir Alexander Campbell Mackenzie KCVO (22 August 1847 – 28 April 1935) was a Scottish composer, conductor and teacher best known for his oratorios, violin and piano pieces, Scottish folk music and works for the stage.
Mackenzie was a member of a musical family and was sent for his musical education to Germany. He had many successes as a composer, producing over 90 compositions, but from 1888 to 1924, he devoted a great part of his energies to running the Royal Academy of Music. Together with Hubert Parry and Charles Villiers Stanford, he was regarded as one of the fathers of the British musical renaissance in the late nineteenth century.