Clemens Erwein Heinrich Karl Bonaventura Freiherr von und zu Franckenstein (14 July 1875 – 19 August 1942) was a German opera composer.
His brother was Austrian Ambassador to England, Georg von und zu Franckenstein.
[1] Franckenstein studied in Vienna, Austria, and later in Munich, Germany, with Ludwig Thuille and at the Hoch Conservatory in Frankfurt with Iwan Knorr.
After a visit to the USA he conducted the Moody-Manners Opera Company, acted from 1902–1907 as opera conductor in London, then worked at the court theatres of Wiesbaden and Berlin, until the court theaters were abolished after the First World War.
[2] Franckenstein, who married Maria Nezádal, died in Hechendorf am Pilsensee, Oberbayern, Germany at age 67.