Alfred Ottokar Lorenz (11 July 1868, Vienna – 20 November 1939, Munich) was an Austrian-German conductor, composer, and musical analyst.
His principal work is the four-volume Das Geheimnis der Form bei Richard Wagner, which attempts to comprehensively analyze some of Richard Wagner's best-known operas.
Lorenz's work reflects to a great extent his sympathy with Nazi ideology, and has only recently been discredited by scholarship.
Lorenz's career as a conductor and composer lasted until 1920, when he was forced to retire by the Social Democrats.
The four operas covered by Lorenz are Der Ring des Nibelungen, Tristan und Isolde, Die Meistersinger von Nürnberg, and Parsifal.