Anna Deinet (also Anna von Possart and Anna Deinet-Possart) (22 February 1843 – 18 August 1919) was a German operatic soprano who had an active career during the latter half of the 19th century. She had a lengthy career at the Bavarian State Opera where she particularly excelled in coloratura soprano roles. She is best remembered today for portraying Brangäne in the world premiere of Richard Wagner's Tristan und Isolde in 1865 and Helmwige in the premiere of Wagner's Die Walküre in 1869.[1][2]