Johanna Geisler, or Geissler (born Johanne Elisabeth Meyer; 28 May 1888 – 3 November 1956), was a German operatic soprano and stage actress.

She began her career as a member of the opera chorus of the Hofoper Hannover in 1903, and had a solo engagement at the Mainz Municipal Theatre from 1912.

[9] On 1 September 1916, Geisler began at the Cologne Opera,[9] where she was successful in roles such as the Queen of the Night in Mozart's Die Zauberflöte, Micaela in Bizet's Carmen and Zerbinetta in Ariadne auf Naxos by Richard Strauss.

Marianne Klemperer, the conductor's sister, described her as with "a very lively face with expressive nose and lips, but not particularly slender", and later "she must have nerves of steel, she has a lot of humour and is very jolly".

[5] They married on 16 June 1919 in a Jesuit chapel in Cologne, with a small group of family and friends attending, including the philosopher Max Scheler.

[9] With her husband as chief conductor in Cologne, she appeared in leading roles of a broad repertoire including Mozart's Despina in Così fan tutte, Susanna, Cherubino and the Countess in Le nozze di Figaro, and Donna Elvira in Don Giovanni.

[17] In July 1927 she performed, as Johanna Klemperer, the leading role of Hèlene in the world premiere of Hindemith's short opera Hin und zurück at the Baden-Baden Music Festival.

She performed there, sometimes using the pseudonym Hanne Klee, roles including Susanna, Donna Elvira, Marzelline, Verdi's Luisa Miller, Marie in Smetana's The Bartered Bride, Puccini's Madama Butterfly, Hindemith's Hèlene again, and Adele in Die Fledermaus by Johann Strauss.

She toured with a company named Deutsche Musikbühne as Mozart's Countess and the Witch in Humperdinck's Hänsel und Gretel[9] to Leipzig, Trier, Riga and Reval.

In 1929 she had a small role in Wilhelm Dieterle's last silent film, Ludwig der Zweite, König von Bayern.

[21] The only recording of Geisler's voice dates to 1932 when she performed in a broadcast of Julius Bittner's Das höllisch Gold [de] as the Old Woman, conducted by Erich Kleiber.

In 1983, her youngest daughter published a book about her mother's youth up to her marriage to Klemperer in 1919, Die Personalakten der Johanna Geisler [de].

[2] Eva Weissweiler wrote a biography of Otto Klemperer, published in 2010, which also covered his relationship with his wife, who is described as a "great singer and loyal companion" ("großartige Sängerin und treue Gefährtin").