Anton van Rooy (1 January 1870 – 28 November 1932) was a Dutch bass-baritone. He had a voice of enormous proportions and is most remembered for his association with the music dramas of Richard Wagner, especially the Ring Cycle, The Mastersingers of Nuremberg and Parsifal. After leaving the Metropolitan Opera, van Rooy became the leading Wagnerian baritone of the Frankfurt Opera; but by this juncture his voice had deteriorated prematurely due to vigorous over-use and his willingness to sing roles with a higher range than was ideal for his sonorous instrument.